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



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.

Ultrasauros.


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.
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