Pleistocene of Texas. The largest prehistoric mammals – South American giant short-faced bear versus human size comparison. Like Uintatherium, Eobasileus cut a vaguely rhino-shaped profile and had an exceptionally knobby head sporting three matched pairs of blunt horns as well as short tusks. Explore Wikis; Community Central; Start a Wiki; Search This wiki This wiki All wikis | Sign In Don't have an account? Before dire and gray wolves roamed North America, an even bigger member of the canine family (the biggest member ever, in fact) was here. (By the way, Astropotherium's name—Greek for "lightning beast"—seems particularly inappropriate for what must have been a slow, ponderous plant eater.). This slow-moving prehistoric armadillo Doedicurus was not only covered by a large, domed, armored shell, but it possessed a clubbed, spiked tail similar to those of the ankylosaur and stegosaur dinosaurs that preceded it by tens of millions of years. Pleistocene epoch (North America)2 $ 0. The paucity of teeth in Hapalops' mouth is a clue that this mammal subsisted on soft vegetation that didn't require much robust chewing—maybe it needed a bigger brain to find its favorite meals. Name: Protoceras (Greek for "first horn"); pronounced PRO-toe-SEH-rass, Size and Weight: About 3-4 feet long and 100-200 pounds, Distinguishing Characteristics: Four-toed feet; three pairs of short horns on head. In 1741, a population of a thousand giant sea cows was studied by the early naturalist Georg Wilhelm Steller, who remarked on this megafauna mammal's tame disposition, undersized head on an oversized body, and exclusive diet of seaweed. Exhibit A is the newly discovered Agriarctos, a pint-sized (only 100 pounds or so) prehistoric bear that spent much of its time scampering up trees, either to harvest nuts and fruit or to evade the attention of large predators. Continent-size ice sheets cover 30 percent of the earth's landmass, and strange creatures rove the landscape. Wikis. Merycoidodon is one of those prehistoric herbivores that's hard to get a good grasp on since it doesn't have any analogous counterparts alive today. Like modern deer, Synthetoceras seems to have lived in large herds, where the males maintained dominance (and competed for females) according to the size and impressiveness of their horns. The woolly rhino is famous … The horse has undergone multiple changes over the past 50 million years and today holds a place deep within the human heart. Although it was directly ancestral to modern hedgehogs, for all intents and purposes Deinogalerix looked like a giant rat, with its naked tail and feet, narrow snout, and (one imagines) overall peskiness. Name: Hyracodon (Greek for "hyrax tooth"); pronounced hi-RACK-oh-don, Historical Epoch: Middle Oligocene (30-25 million years ago), Size and Weight: About five feet long and 500 pounds, Distinguishing Characteristics: Horse-like build; three-toed feet; large head. This was the biggest of all the creodonts, the carnivorous mammals that preceded modern wolves, cats and hyenas, weighing close to a ton and with a long, massive, powerfully jawed head. Name: Desmostylus (Greek for "chain pillar"); pronounced DEZ-moe-STYLE-us, Habitat: Shorelines of the northern Pacific, Historical Epoch: Miocene (23-5 million years ago), Size and Weight: About six feet long and 500 pounds, Distinguishing Characteristics: Hippo-like body; shovel-shaped tusks in lower jaw. Some are well known, such as the cartoon favorite woolly mammoth and the American mastodon, while not as many people are familiar with the Amebelodon and the Gomphotherium. 7,515 Pages. Named by a bemused paleontologist after its odd mix of features, Paleoparadoxia (Greek for "ancient puzzle") had a large, horse-like head, a squat, walrus-like trunk, and splayed, inward-curving legs more reminiscent of a prehistoric crocodile than a megafauna mammal. 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