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.

Cynognathus.




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.
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