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 Ancient animals :: post-dinosaurs time 
American Lion
Lions, slightly larger than living African lions, once roamed America from Alaska to Peru. Their remains have been found in Ice age deposits in the western Yukon and southern Alberta that range in Age from 20,000 to more than 70,000 years.
American Mastadon
Compared to modern elephants, mastodons were squat and long in the body. Often vestigial tusks were present in their lower jaws. Shoulder height varied from about 2 m to 2.6 m. Hair was coarse and reddish brown.
Cariboo Fleshing Tool
In 1966, a National Museum of Natural Sciences fieldworker found part of a tibia (lower leg bone) of a caribou among fossils of Ice Age animals at a site on the bank of Old Crow River in the northern Yukon.
Giant Beaver
The giant beaver (Castoroides ohioensis) was one of the largest rodents ever known. It reached a length of about 2.5 m and weighed up to an estimated 218 kg.
Giant Rhinoceros
In mid-Tertiary time (about 25 million years ago), Asia was occupied by huge mammals that would appear strange to us today. They included Indricotherium, a gigantic hornless relative of the rhinoceros, and the largest and heaviest land mammal known.
Helmeted Musk Ox
According to the number of fossils recovered, this was the most common musk ox in North America during the last glaciation. It was taller and had a more slender build than the living tundra musk ox.
Scimitar cat
Scimitar cats, related to the better known "sabre-tooth tigers," were about the size of a lion and had razor-sharp, highly-flattened, stabbing teeth. They had bob-tails like the lynx, long, powerful forelimbs, and poorly developed hind limbs.
Short-Faced Bear
This bear seems to have been mainly a flesh-eater and was by far the most powerful land predator during the Ice Age in North America. It may have attacked bison, deer, and horses. The largest known skull of arctodus was found by a Yukon gold miner.
The Dawn Horse or Eohippus
These small ancestors of modern horses were half a metre or less in length -- about the size of a fox terrier. Compared to living horses, their legs were shorter, they had longer heads relative to their bodies, and a more complete series of teeth. They had three toes on their hind feet and four on their forefeet.
Tundra Musk Ox
The species originated in Eurasia, probably reaching North America via the "Bering Isthmus" during the second-last glaciation. When most of Canada was covered by ice, about 20,000 years ago, ovibos herds survived in unglaciated refuges in Alaska and the Yukon Territory, in the northern United States, and possibly Banks Island.
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