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Elasmotherium

Elasmotherium("thin plate beast") is an extinct genus of giant rhinoceros endemic to Eurasia during the late Pliocene through the Pleistocene, documented from 2.6 mya to as late 50.000 years ago, possibly later, in the late Pleistocene, an approximate span of slightly less than 2.6 million years. three species were recognized. the best known, E. sibiricum was the size of a mammoth, an is thought to borne a large, thick horn on its forehead which was used for defense, attacking mates, driving away competitors, sweeping snow from grass in winter and digging for water and plant roots. Like all rhinoceroses, elasmotheres were herbivorous. Unlike any others, its high-crowned were ever-growing. Its legs were longer those of other rhinos and were designed for galloping, giving him a horse-like gait. The Russian paleontologist of the 19th century who discovered and named the initial fossils were influenced by ancient legends of a huge unicorn roaming he steppes of Siberia. To date no evidence either contradicts or confirms the possibility that Elasmotherium survived into legendary times. 

http://en.wikipedia.org/wiki/Elasmotherium

Ultrasaurus

This article is about the dubious dinosaur genus from South Korea. For the invalid dinosaur genus from Colorado, see Ultrasauros.

Ultrasaurus is a genus of sauropod dinosaur discovered by Haang Mook Kim in South Korea. However, the name was first used unofficially (as anomen nudum) in 1979 by Jim Jensen to describe a set of giant dinosaur bones he discovered in the United States. Because Kim published the name for his specimen before Jensen could do so officially, Jensen renamed his specimen Ultrasauros. Jensen's giant sauropod was later found to be a chimera, and the type remains are now assigned to Supersaurus.

http://en.wikipedia.org/wiki/Ultrasaurus

American Lion

The term "American lion" has sometimes been used to mean the cougar.

This article is about the feline. For the Pulitzer-winning biography, see American Lion (book).

The American lion (Panthera atrox) — also known as the North American lion or American cave lion — is an extinct feline of thefamily Felidae, endemic to North America during the Pleistocene epoch (1.8 mya to 11,000 years ago), existing for approximately1.79 million years.^[1] While it was once considered a subspecies of lion closely related to the Eurasian cave lion (Panthera leo spelaea),^[2] later study showed that it was not in fact a true lion and cannot be assigned to any modern species of cat.^[3]

The American lion was one of the largest types of cat ever to have existed, slightly larger than the Early Middle Pleistocene primitive cave lion, P. leo fossilis and about twenty-five percent larger than the modern African lion.^[4]

http://en.wikipedia.org/wiki/American_Lion