Kaprosuchus saharicus.

Kaprosuchus saharicus was a huge crocodile that lived in the Upper Cretaceous in Niger (Africa). This dinosaur is not extremely large as it could be other prehistoriccrocodiles as Deinosuchus or Sarcosuchus Imperator. "Only"average 6 meters but what is striking is his face. He had a terrible predator face, large protruding teethabove and below the jaw and a rough bump on the snout (emerging from thesquamous and parietal) giving it an aggressive appearance that recalls when wolvesbaring their teeth defensive position . We, as the most terrible dragon fantasy filmstoday.

Another difference between the Kaprosuchus saharicus and other crocodiles is thatthe basins of the hojos projected forward, not upward. Had stereoscopic vision, similar to the hunters like lions or wolves.
In fact, this animal was a predator prehistoric Earth, but also water. Because land isattributed hunter strong legs that allowed him to pursue their prey with great speed and run at a certain height from the ground (to be cococrilo).

Finally, thanks to their appearance, their disproportionately large, sharp fangs, was given the name of Kaprosuchus, meaning crocodile boar. Referring to the tusks of theboars that tend to stand out from the muzzle. And saharicus that their bones werefound in the Sahara.


The Gigantoraptor is half bird, half dinosaur, not known, but what is .... is that it is a mystery.

Discovered in 2005 in the Gobi desert, lived 80 million years ago in the land of the Cretaceous period.
Its resemblance to the birds include anatomical features such as a peak instead of teeth in the jaws and the possibility of being covered with feathers. That's why we think it is the largest winged animal that has never existed. Whether flying or not.

Another question that appears on this prehistoric animal, half dinosaur, half bird, is your diet: it is thought that it was herbivorous, but on the other hand, has strong claws and is regarded as agile and fast moving, predatory characteristics. In short, we'll know later.

But how long the Gigantoraptor? For their measurements are 5 meters (17ft) tall to 8 meters (26ft) long and weighing about 2 tonnes. Oviraptoridae family, is the oldest. The Oviraptoridae are a group of dinosaurs known to include many feathered species. Gigantoraptor was much larger, about 35 times larger than its likely close relative, Caudipteryx.

Kelenken guillermoi.

Some time ago we spoke of wallerian Titanis, the second largest bird of the subfamily Phorusrhacidae, or better known as terror birds. It should be noted that in the Subfamily Brontornithinae Terror Birds are heavier and bigger as the bird Brontornis.

Phorusrhacidae and Brontornithinae are subfamilies of the family of Phorusrhacids.Anyway, on with the Kelenken.

The largest bird is the Kelenken guillermoi. He lived in South America 15 million years ago (Miocene), recall that lived in North America wallerian Titanis for 5. And he could measure up to 2.5 meters tall and weigh about 160 kg elenken was quick and could hunt and devour rodents, reptiles and small mammals.

It is the largest known predatory bird in history. And not just any predator was in the top of the food chain, and could face other super-predator of the time.

Two features of Kelenken guillermoi my attention:

1 - The size of the head: This came to be more than 70 cm long, with the bird known as the largest skull. Imagine a large ostrich, but with a pointed beak and hook and 7 times larger. All supported by a robust and strong neck.


2 - The second thing that strikes me is the speed: I could outrun an ostrich. The ostrich is known for the speed provided by its two strong legs, reaching up to 65 km / h. The Kelenken guillermoi being young could reach 100 km / h. Come on, that may strike a galloping horse without difficulty.

Procoptodon Goliath.

This huge kangaroo lived in Australia until 18,000 years ago and apparently, the man was partly to blame. And although it is unclear the role of men in ending the Procoptodon, seen the Holocene mass extinction that occurred mainly men (apart from climate change), I have been surprised that Aboriginal Australians. But hey, that's just my opinion.

The Procoptodon measuring 1 meter current that kangaroos and reached weigh 250 kg (2 ½ times more than the actual red kangaroo with an average height of 3 meters.
These giant short-faced kangaroos had their eyes facing forward. At the foot had just pointed a long finger-shaped arrow. With these strange feet moved quickly through the woods and meadows, where he ate grass and leaves. He had long arms.


Tiktaalik was primarily the characteristics of a fish, but with the tips forming skeletal structures similar to an arm, similar to those of crocodiles, including shoulder, elbow and wrist. He had the sharp teeth of a predator, and his neck could move independently of his body, it is not possible in other fish. The animal also had a flat skull like the crocodile eyes on the top of the head, suggesting that spend much time looking up, neck and ribs like those of tetrapods, which will serve to support the body and help to breathe through lungs, a long snout can catch prey on land, and a gill opening, in higher animals, would subsequently become heard. Its discoverers felt that, in all likelihood, Tiktaalik flexed its proto-limbs in the main river bed and could have pushed himself to the shore for brief periods. These specimens reached a size of 1.2 to 2.75 meters.

He lived in the Devonian period about 375 million years.

Excellently preserved remains of Tiktaalik in 2004 were found on Ellesmere Island in Canada.

Along with Ichthyostega, Coelacanth and Acanthostega is one of the prehistoric animals that show as was the transition from fish to tetrapod.

For more information:

Triops cancriformis. The oldest animal in history.

This animal is a Triops cancriformis, is considered the oldest prehistoric animal still exists. It is truly a living fossil appeared on earth 200 million years ago (Triassic).
The discovery of this species was by accident while researchers at the University of Glasgow mud collected for further experiments.
The crustacean Triops branchiopods cancriformis are some belonging to the order of Notostraca. Receive various common names, such as turtles or tortuguetas.
The Triops has three eyes, two compound eyes internally and naupliar eye in between, a flattened oval shell that covers the head and body segments bearing appendages. Found at the bottom of ponds and lakes, where they move with the belly down. In case of shortage of oxygen, it may swim belly-up on the water surface, are omnivores, and dig into the bottom of the puddles in search of food. Their diet is based on plankton, insect larvae, worms and even tadpoles when they are weak. You can also watch Triops cannibalism during moulting of the shell as they are more susceptible to predation.

Its life cycle is very fast and is perfectly adapted to drought. Eggs buried in dry mud can withstand heavy frosts during the winter and hatch in 2 or 3 days with the humidity of the first rains, but is required a minimum temperature of 23 degrees centigrade for it. Triops youth, with an omnivorous diet, begin feeding frenzy around what they find. Navigate through the bottom digging in the mud and prefer to feed on plant detritus but if this scarce eat tadpoles, conspecifics artemia or when moving the shell and are more fragile. Reach a height of 10 cm and grow old and die before the month and a half of all offspring leave they can. If males are scarce, as is usual, the females can reproduce by parthenogenesis without the collaboration of these. The eggs can travel in the mud that sticks to the legs of the birds that visit their ponds and so can spread throughout its range (Europe), plus they can remain latent for years.
They are fairly easy to breed in captivity and there are virtual shops on the internet that sell bags of eggs to keep them in aquariums.

Do not you remember the Paradoxides Davidis?


During the Cambrian explosion of life (for about 525-510 millions years. Up to this point had not been very successful multicellular life) appeared the first predator to bite, was the Anomalocaris. The biggest predator of the Cambrian seas. Measure up to 1 meter and its name means "strange shrimp."

Possibly it was given this name because when they discovered the fossils were so strange that they thought of three different animals.

It had a segmented body, such as some crustaceans and a current "arms" armed with thorns, compound eyes (with a very developed on their prey, but not entirely confirmed). The mouth was circular and had 32 overlapping layers (four large and 28 small) equipped with small barbs which failed serrated rings around a central opening. With his arms gripping the defenseless Pikaia or trilobites and pounding and crushing.

Like trilobites, the Anomalocaris was an arthropod, bony internal skeleton had not, this was a protection mechanism, a cuticle or exoskeleton made of chitin and proteins such as cuticulina.

Curiosity: A recently described a new species closely related to Cambrian Anomalocaris the Hurdia victoria.

Daeodon. Pig or boar terrible.

Entelodon has long talked of a huge boar, terrible and effective predator. Well, Daeodon was further developments. It was a little larger, reaching 3.6 meters long and 2 meters high. With a head of more than 1 meter in length that had a strong jaw with a bite (similar in proportion to the actual pigs and wild boars) and large and deadly fangs. The neck was short and thick and had a hump on the back along the spine.
With a strong and robust body reached a speed of 35 km / h, and managed to bring down their prey in the form of ambush and was once a short distance faster than performing a surprise attack their prey and bite and squeeze your strong bite.
He lived during the Miocene, about 24 million years ago in North America.

Among the causes of their extinction is thought to be one of the reasons was the gateway to the continent of Bear-dog or Amphicyon. More agile and fast and safely with a structure similar to the wolf pack that offered a performance at top predator.

Is it possible to resurrect prehistoric animals?

Is it possible to resurrect prehistoric animals?

If we refer to dinosaurs as depicted in the film Jurassic Park, it seems that currently it is impossible not to resuscitate. While experts are very excited to think that in future it may be.
Apparently it has been able to recreate a living ... but very simple ... is actually a bacteria. Pour bacteria (Mycoplasma mycoides) is the first time you create a synthetic life form. To achieve this, the researchers built a machine in his laboratory every one of the basic units of DNA of the bacteria 'Mycoplasma mycoides' and assembled as if it were a Mecano. Once assembled the intricate puzzle, emptied a cell of another species of bacteria and introduced the synthetic genetic code in the cell container. And that's it ...
But of course, there are limitations:

1st - The Pour bacteria is very simple, basically a membrane genome, but in more complex organisms the DNA is packaged in the nucleus. And no one, until now, has been able to empty the heart and inject DNA into the interior.

2 - DNA sequences tend to deteriorate over time, and it is very difficult to draw a complete map of animals that lived millions of years could be the known T-rex. However there are other prehistoric animals, and extinct, are possible candidates ... as recently extinct and has obtained a DNA map comlete. Saber-toothed tigers, mammoths, cave bears, Tasmanian tiger, woolly rhinoceros, giant sloth and even our cousins the Neanderthals. All of them disappeared less than 100,000 years ago.

3 - There must be akin to a living animal which wants to revive, for example, to the mammoth elephant would be required to insert the embryo. But of course, to resurrect the kind of Neanderthal what it would take would be a woman. And this will bring much discussion and many different opinions, which I think could be done though, many voices that would oppose it.

4 - The environmental conditions of animals are now missing, in some cases, nonexistent. And basically serve as scientific purposes. There are no dams Sabretooth or frozen grass to keep Mammoth.

Well, I always think I conclude with this question: If you could resurrect a Neanderthal, what do you think think a Neanderthal resurrected in our world?

The famous Bear-dog or Amphicyon

Imagine the world's largest wolf, and now doubling in size, finally give steroids to duplicate the musculature. Throw in claws bigger than a grizzly with a strong legs to run and reach high speeds ... That leaves us? As a predator that existed from the mid-Oligocene and early Miocene. His name was Amphicyon ingens (dog ambiguous) or commonly known as Bear-dog.
This prehistoric beast could be up to three meters and weigh up to 400 kg. Given its size, you might think was not very fast, but do not be fooled, it is thought that hunted their prey in ambush and surprised with a quick career. The smell was due to an as refined as a bloodhound and a fine ear. Type of game similar to the great bears today. He could hunt animals as robust as the old giant sloths or rhinos.

He lived in Europe and Asia and later introduced in North America by the Bering Strait (humans migrated from Asia to the Americas through the strait, possibly taking advantage of a glacial period and the freezing of the Sea) competition in North America other carnivorous even more ... the Daeodon or "terrible pig."

Abelisaurus or Abel's lizard

At the end of the Cretaceous period in what is now South America, approximately between 83 and lived 80 million years ago the "Abel's lizard" or Abelisaurus. With a skull up to a meter and sharp teeth this carnivorous predator of between 7 and 9 meters (25 to 30 feet)long and weighed about 3000 kilograms, were living with other predators such as known Tyrannotitan or Carnotauros, fierce competitors for the same prey as old tyrannotitanes patients. The Carnotaurus, was probably a abelisaurid early, scientists assume that Abelisaurus also had front legs short and slender limbs.

The discovery of Abelisaurus is important because it sheds light on many theropods (carnivorous diet and walking biped with three fingers to the front and provided with sharp claws) than the southern hemisphere that were very different from their relatives in the northern hemisphere. This was the result of the separation of land masses of North and South that began in the Jurassic period.
Not go into the morphological differences ... anyone who wants to know them I invite you to search Wikipedia.

Hyena giant or Pachycrocuta Brevirostris.

Famous is the force that have the jaws of the hyenas that can reach pressures of 350 kg (600lb)and teeth grinding of hard bones and teeth and hooves. Well, now imagine a hyena twice as big, twice as strong and a powerful jaw twice ... this animal there was Pachycrocuta brevirostris.

Pachycrocuta a genus of prehistoric hyenas. The largest specimen, well-documented part of the species of giant hyenas Pachycrocuta brevirostris. With a height of 1 meter (39 in) and weigh up to 120 kg (250 lb).Un similar in size to a small lioness.
This size would make it the largest of the hyenas that have ever lived. He lived from the Middle Pliocene and Middle Pleistocene, about 3 million and 500,000 years ago.
Found fossils in Eurasia and southern and eastern Africa. In dens, caves used as dens.
Scavenger and a predator could be stubborn and tenacious to deer hunting big and small package was probably a hunter of large animals (up to larger deer and occasionally as Megaloceros). The chance of a scavenger is sensed it was a very big animal not built for chasing prey over long distances. In this aspect would have differed from today spotted hyena, which is a more agile animal that, contrary to his image of the documentaries, also kills his own food. Apparently it was ecologically close enough to the smaller (but still important) in relation perrieri Pliocrocuta never found as fossils contemporaries in the same region.

This is a very beautiful reconstruction extracted qi.com

Cheetah Giant or Acinonyx pardinensis

The problem that presents itself now is the cheetah who specializes in speed, his muscles has focused on this goal. That's why the dams are often stolen by other predators such as lions, hyenas, leopards even African dogs. Well, there was an ancestor who lived in the Quaternary, the Pleistocene (over 1 million years) and with a size twice as large as the current cheetah, reaching weigh over 120 kg (264 lbs)and over 2 meters long excluding the tail(6 feet 3 inches). High BMI, used more nails (in comparison with modern cheetahs), suggesting that it was less suited to high speed, although it is believed that he could reach over 70 mph(lower than the current but faster than everyone else cats. We must remember that current Cheetahs reach speeds of 115 km / h.
But this theory suggested by the great weight is offset by the antithesis: you think you might be even more than the current cheetah because its legs were of a larger size.
Because of its bulk, it needs to go very fast after prey. Deer, mountain goats, moose and sambar (deer species) were their prey.
It is thought that went extinct 10,000 years ago.


The size of a large dog, this therapsid (reptile-like mammals) was a terrifying predator of the prehistoric period. He lived in the Triassic and Lower Jurassic (made between 245 and 208 million years ago) in what is now South Africa, Argentina, China and Antarctica. It was one of the most impressive land predators of its time.
Praising Cynognathus fossilized skulls of openings have been observed at the height of the snout, typical skulls of mammals, where vessels and nerves pass supplying the whiskers, similar to cats and dogs. So you think you had hair, and that these particular should serve as sensory organs.
With almost two meters long (6.3 ft counting the tail) and a head of 30 cm (1.0 ft) with wide jaws and sharp teeth, its bite was strong and had to exert great pressure (similar to today's crocodiles with 2500 kg of pressure.
The Cynognathus was an agile runner and can reach a speed of 35 km / h. .. conclusion was a very effective and powerful carnivore.

Colossochelys atlas or Testudo atlas

Testudo atlas or Colosoqueli, was the largest turtle. It was, to get a great idea to double that giant tortoises that live today. Reached 2.5 m in length, a height of 1.5 meters and 4 tons.
His legs, like an elephant, were projected on the sides of the body and held the heavy shell of the back. The almoahadillas in the soles of his feet compact distribute the great weight among the five fingers of each leg, with robust claws. It was probably herbivorous and their relatives today. Faced with danger, could get his head and legs in heavy bony armor to protect themselves.
Testudo atlas or Colosoqueli lived in South Asia more than a million years, Pleistocene.

In this video you can see a current Giant Tortoise. It should be intoaccount the Testudo Atlas, could weigh up to more than 15 times its weight.

Curiosity: Although the Testudo atlas or Colosoqueli is the largest turtle that ever lived, not the animal that has existed more shell. This would be the Arquelón 3.7 meters long. This is a sea turtle extinct.


Estemmenosuchus prehistoric animal was a big and clumsy. Similar to the current rhino. The Estemmenosuchus "crocodile crowned" is named by the horns formed from the bones of the skull that are in the front and are directed upward.
He lived 225 million years ago in what is now Russia, the Permian period. Being the largest of its time with the Dimetron.
For the fossils found in the skulls, it is thought that it was an omnivore.
There are two known species of Estemmenosuchus:

1 - Uralensis Estemmenosuchus ("crocodile Coronado Urals). The characteristics of the species are the horns projecting up and out on the side of the head. Since this kind of about 4-5 meters long. The mouth contains large canines followed by small molar teeth.

2 - Estemmenosuchus mirabilis (wonderful Crocodile Coronado). This species had bony projection 2 knobs on each side of the skull, one on top facing upwards apparently pointing horns and other similar sides uralensis.


The dimetron, was not a dinosaur but looked very similar. In fact it is closer to the first mammals to reptiles.
This ancestor of mammals was the dominant predator of its time, during the Permian period of the Paleozoic era, made between 280 and 260 million years.
Could reach 3 meters long and had a long tail. A short legs and an elongated body provided them with a motion similar to those of the current monitors.
Another feature is its teeth Dimetrón two different types of teeth: a Shredder and a very sharp cuspids heartbreaking.
But the most distinctive feature is the spectacular dimetrodonte sail on its back. The candle used it, probably, to regulate body temperature because their large surface area allowed to warm up or cool efficiently. The flap was supported by the neural spines, each one sprang from an individual vertebra. You may also wear the dorsal fin in the courtship of mating or to ward off other predators.
The Dimetrón was a fierce predator that used two pairs of sharp pointed canines for tearing the skin of their victims. With the jaws closed, the Dimetrodon appeared to be smiling, but when he opened and showed his wide mouth, his appearance was not friendly at all. His jaws were so large that probably could devour animals of the same size.


Nothosaurus is an extinct genus of sauropsids (reptiles) Triassic marine, was among the first plesiosaurus (like the famous Elasmosaurus). Its name means "fake lizard" and who were not lizards like today's or even a dinosaur.
His teeth, very sharp as daggers, which also fit together those in both jaws, was a perfect trap for fish. Nothosaurus could close the mouth with great force but the muscles that allowed him to reopen it were very weak. Some of the best preserved fossils preserve the skin and drawing show that Nothosaurus had webbed feet, suitable for both the aquatic environment and to the land.
They could spend part of their life on land, on the sand and rocks. The tips allowed them to walk and move awkwardly arched his back, like lions today. You probably arrived on shore to stretch out, relax and warm in the sun, capturing prey on the pools of the shore and to reproduce by laying eggs. Breathed air, as shown by the two nostrils at the top of his nose, and although it was undoubtedly a stylish swimmer, was not so well adapted to an aquatic lifestyle as full-time as Opthalmosaurus ichthyosaurs.

Giant wolf or wolf terrible.

The terrible giant wolf or wolf is a species of extinct large canine that lived in North America during the Pleistocene. Certain features present in this field, suggests that dire wolves, like many other dogs, were social animals who lived and hunted in packs.
Although invited to think what its common name, the giant wolf was not exceptionally large compared with its relative, the common wolf or gray wolf (Canis lupus.) On average, weighed about 80 kg. However, the differences with the other canines, with whom he shared habitat for 90 000 years, are important.
Canis dirus was more robust and proportionally shorter legs, so that it would be a great runner. The nose was long and powerful jaws, thick, strong teeth capable of crushing bones. All this suggests that animals hunted cumbersome, injured or ill, and often feed on carrion. The niche occupied by meadows and steppes in the North American ice age was similar to that hyenas had on other continents. A large number of fossils of herbivores crushed by the jaws of giant wolves reinforce this idea.
Probably became extinct 10 000 years ago, like the rest of the American megafauna.

Some fossil discoveries made in Arkansas indicate that could live in the Ozark Mountains until only 4000 years.

To read more http://es.wikipedia.org/wiki/Canis_dirus

Giant deer or Megaloceros

The Irish elk, Giant deer Megaloceros deer is the largest in history. Like a large deer, his antlers were up to 3.5 m from tip to tip. Although he lived in Europe and much of Asia for half a million years to extinction in recent times, often known as "Irish elk" for the abundant findings of specimens preserved in the peat bogs of Ireland.
The giant deer reached a height of 2.2 m to the cross in the case of males, significantly higher than the largest of the moose. It was a species with strong sexual dimorphism, as females were significantly smaller and slender than the males, in addition to lacking an impressive antlers.
The giant deer grazers were animals that thrived on abundant grass and shrubs in the large, cold plains covering much of Eurasia during the Pleistocene.
Antlers were so large that it required large amounts of calcium and phosphate to form occurring cases of osteoporosis among male Irish elk, so that mortality, already high, increased in bad years.
This fantastic animal became extinct only 7000 years. Were extinguished by changes in the field that were caused by early Neolithic farmers Russian.

Macrauchenia ( Macrauchenia patachonica. )

The Macrauchenia is an extinct mammal with a body of a camel and a short trunk, reaching two and three meters long. (9.8 ft) with 1500 Kg of weight. Dwelt on the plains of South America in the Tertiary and Quaternary disappearing more than 8500 years ago. Despite having long-legged three-toed ungulate is unlikely to run at high speed due in part to the robust frame of body and hind legs that were shorter than the front. Age of herbivorous, eating in areas where I spent most of his time as swamps and grazing, provided him with his prehensile lip boot pastures. Its fur was short, similar to that of a modern horse. He had a trunk like they were today tapirs.
Contact with the men contributed to their extinction, as hunters have taken advantage of its low travel speed to kill and eat.


Hoplophoneus is an extinct genus of carnivorous mammals that lived in North America during the Eocene-Oligocene (38-33,3 million years ago).

It was the size of a leopard, with a stocky body and short legs, and about 40 kg in weight.

Also had a groove in the lower jaw where they settled long saber-like canines of the upper jaw, but never to be considered a saber tooth. Experts believe that this mammal patiently perched in the branches of the trees and then jumping on their prey and causing fatal injuries with long, sharp fangs.

The Hoplophoneus was similar to cats, although they were not. The structure of the inner ear bones are different, the cats have an external structure called the auditory bulla separated by a partition into two chambers, the lack nimrávidos noise.

Curiosity: As Eusmilus, the Hoplophoneus, had teeth that hid when not in use, the cat kept his fangs in special bags adapted in the lower jaw .

Andrewsarchus or "androsarcus"

The Andrewsarchus is related to the sheep and goat, but has wolf's clothing. Mmífero was a giant of the time. It has a meter jaws, and scavenger. They lived in the late Eocene.
He walked on four short legs and a long body, long tail, and feet with hoofed toes. He had a long snout with large, sharp teeth and flat teeth may have been used to crush bones.
Had a length from snout to the back of the pelvis of about 3.4 m and a height from the ground to the shoulder or mid-back of approximately 1.5 m. Probably weighed about 1000 kg
Your diet may have been more carnivorous and omnivorous that is not yet clear whether he was a hunter or scavenger, because the teeth are more characteristic of a scavenger with teeth grinding.
He is considered the largest known terrestrial carnivore to date.

Sauroposeidon, The largest and heaviest dinosaurs of Earth's history

The Sauroposeidon who lived during the Cretaceous, in what is now North America, is the largest known lizard, long and weighing of all land animals throughout the history of the Earth. Hence its name, which means "lizard god of earthquakes."
This vegetarian sauropod is ahead in size and weight above Argentinosaurus, Ultrasauros and other sauropods.
Well, the Sauroposeidon reached 17 meters in height (as a 6-storey building) and weigh up to 60 tons (more than 10 African savannah elephants together) and a length of 35 meters (100 ft).
To give an idea of what was long enough to know that one of his vertebrae could be up to 1.20 meters long (4 ft). And only the neck measuring up to 12 meters (37–39 ft).

This is why it is ranked as the longest dinosaur history.


These amazing animals are among the heaviest dinosaur that ever lived. Although his body resembled that of other sauropods, surpassed in size to most of its peers. It was about 25 times heavier than a giraffe long as three buses and as tall as a six-story building. Its neck and tail, incredibly long, were supported by a backbone like a grill. At the sides of the vertebrae, there were some openings that reduce weight without weakening his back. Most of the weight of its giant dinosaur bore members. Therefore, major bones were the blades, connecting the front legs with the body. The was large and strong, each of them would be higher than a soccer goal. His back was lower than their shoulders, as the hind legs were shorter than the front. When grazing among the plants and bushes, swinging his long neck in all directions. It could reach the juicy leaves of higher tops and low ferns. I needed lots of vegetation, cutting his teeth beveled. For easier digestion, probably swallowed small rocks that were deposited in your belly and helped to turn plants into pulp. Although hard to imagine, experts have suggested that brachiosaurids like this, roamed in herds slowly advancing. Surely the ground shake under their feet. The sheer size of an animal as this dinosaur probably deterred most predators living at the time. But if one is away from the bequest, was exposed to grave danger. On the inside of his legs, like those of elephants, had a sharp claw. With an accurate kick and a flick of its tail flexible, could bring down his enemy. Measuring up to 30 meters long and a little more than 15 high. It lived about 145 million years, at the end of the Jurassic period in North America.

Curious: There is another dinosaur called Ultrsaurus, but not the same, is smaller and fossils found in Asia.

Henodus chelyops.

Henodus chelyops ("Turtle-Faced Single Tooth") was a placodont of the Late Triassic period during the Carnian stage. Fossils of Henodus chelyops were found in Tübingen, Germany. It was around 1 metre (3.3 ft) in length.
Henodus was the placodont that had the greatest (albeit superficial) resemblance to a turtle. Like turtles, it had a shell formed from a plastron on the underside and a carapace on top. The carapace extended well beyond the limbs, and was made up of individual plates of bony scutes covered by plates of horn. However, the shell was composed of many more pieces of bone than that of turtles, forming a mosaic pattern. The armor was fused to its spine, and its limbs were situated in normal positions, unlike the turtle, where they are located inside the ribcage. The weak limbs of Henodus suggest it spent little, if any time on land.
Henodus chelyops also had a single tooth on each side of its mouth, though the remaining teeth were replaced by a beak. These teeth were flat to crush bottom dwelling shellfish. The head was squared-off at the front, just ahead of the eyes.
Henodus is the only placodont thus far found in non-marine deposits, suggesting it may have lived in brackish or freshwater lagoons.


Helicoprion is a prehistoric cartilaginous fish that first appeared in the Carboniferous ocean finally extinguished in the Late Triassic, about 225 million years.
Helicoprion is thought may have reached a size of about 7 meters long and about 2 tons.
Since you do not have any skull, his way of feeding or predation techniques fall within the realm of speculation. One hypothesis is that fed on ammonites and their teeth were specialized in the task of breaking the shells of these animals.
Have been found in many parts of the world, which indicates its success in a given period.

Here I leave some pictures of different artists and their fossils.

Giant castor.

The beaver is an extinct giant rodent Castoridae family. It is one of the largest rodents that ever existed, which reached the size of a bear. He lived about 50,000 years ago during the Pleistocene in North America.
He used his teeth to chew tough vegetation and bark, was a good swimmer, but did not build dams. Other types of beaver build dams to protect themselves from predators but in this case was protecting its own gigantic size, were found fossils of giant Castor from Florida (southern U.S.) to northern Canada.
Unlike the current beaver had a wider rear legs relative to its body, making it easier to swim faster.
Other differences are observed in the teeth. The cutting teeth (incisors) of the giant beaver were up to 15 cm long.
Despite their general similarities, the giant beaver and the modern beaver are not close relatives. The giant beaver Castoroides is classified in the genus, while the modern beaver Castor belongs to. There are two species of beaver giant Castoroides Castoroides ohioensis and leiseyorum.


The Therizinosaurus was a bipedal animal with vicious prehistoric claws was found in Mongolia (Asia)
THE Therizinosaurus measuring up to 12 m long. His weight was up to 6 tons. The total arm measured 2.5 meters long, and his only scythe-shaped claw measuring 70 centimeters in outer curve. That length does not include the horny covering that must have surrounded the claw, with which it could reach up to 1 meter long.

Therizinosaurus ( "scythe lizard") lived in the Cretaceous (for about 70 to 65 million years in the Maastrichtian).

He lived together with other prehistoric animals like the striking resemblance and Erlikosaurus Segnosaurus.

Are unknown Therizinosaurus eating habits. These are unknown as fossils found in was not found remains that may determine your diet. He may have been herbivorous although the claws may be possessed for the struggle to defend territory or to mate, even to defend themselves from predators like the Tarbosaurus.

Crassigyrinus scoticus

Crassigyrinus scoticus (large tadpole) had a streamlined body up to 1.5 meters long and 30 cm wide.
The prehistoric animal legs were small in comparison to his body and probably of little value, this indicates that the Crassigyrinus scoticus was perfectly adapted to aquatic environments and did not venture in land area.

The highlight of the Crassigyrinus scoticus was that he was big and strong jaws, equipped with two rows of sharp teeth.
Studies have shown that this Carboniferous animal had a jaw opening up to 60 ° can easily catch their prey. To this we must add a lot of pressure that made his jaw bite one of the most fearsome of the time.

The jaw opening and the speed and agility that gave it its long body and aerodynamic, suggests that between prey fish came fast movements.

Crassigyrinus had eyes rather large, thereby helping to find prey in dark places or in murky water.

This prehistoric amphibian lived in Europe (fossils have been found mainly in Scotland) during the Carboniferous.


Megalosaurus was a predator of some up to 10 meters long and weighing 1 t. He lived in what is now Europe, America, Asia and Africa during the Jurassic period, 181 made 169 million years.
Among their prizes were sauropods, large prehistoric animals and stegosaurs and mammals.
Besides being a fast predator, with speeds that could reach 40 km / h thanks to its well-balanced structure, the Megalosaurus also got their food scavenging.
The Megalosaurus was one of the first dinosaur discoveries, England 1818. At that time, and seeing the fossils found, these bones were so enormous that gave its name Megalosaurus (great lizard).
The jaw of Megalosaurus had teeth long and curved, strongly subject to the gums to avoid losing in the struggle. The teeth were sharp with the corrugated edge that worked like a saw. Ripping a more efficient prey.
To make matters worse, had prehistoric animal with sharp claws and tear that held the hard skin of the victims.


The Ceratosaurus had skulls with a structure similar to the dorsal horn on the snout, centrally placed in the nasal cast. They had fused sacral bones (Synsacrum) and the pelvic bones together and held together this structure. A row of small bony nodules or osteoderms were presented under the middle of the back.

The Ceratosaurus could have competed with Allosaurus and Torvosaurus for the same prey (giant sauropods Diplodocus, Apatosaurus and Camarasaurus), but this was smaller by about 6 to 8 meters in length, 2.5 in height, and weighing from 500 kg to 1 tonne would have an ecological niche occupied separately from their larger cousins. Moreover, the Ceratosaurus had a longer body and supple, with a tail shaped like a crocodile. This suggests that was a better swimmer and Torvosaurus Allosaurus. A recent study showed that Robert Bakker Ceratosaurus dams usually hunted waterfowl, such as fish and reptiles, but also had great potential to feed on dinosaurs. The study also indicates that adults and juveniles sometimes ate together. This evidence is, of course, very debatable and Ceratosaurus teeth marks are very common in large dams fossils of dinosaurs on land. Another common theory is that the Ceratosaurus has preyed primarily on Dryosaurus, Camptosaurus, and other ornithopods, since it seems a Lonely Hunter adults unable to break down sauropods. An alternative is that the ceratosaur eat carrion of large bodies of sauropods, displacing small small predators.

Ceratosaurus ("lagarto cornudo") que vivieron a finales del período Jurásico, hace aproximadamente 152 y 145 millones de años, en el Kimeridgiano y el Titoniano, en lo que hoy es Norteamérica, África y posiblemente en Europa.
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