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Arctodus Simus

The Ice Age Giant – Arctodus Simus

It’s almost impossible to talk about mammals during the Ice Age without mentioning Arctodus Simus, the “giant short-faced bear”. This amazing creature was one of the largest mammals to ever exist during the Pleistocene Epoch. It is believed to have been 10 feet tall when it stood up and weighed up to 1,000 pounds!

For many years, the bones of Arctodus Simus were misidentified as being from other animals – most people assumed they were from giant ground sloths. This was finally clarified once scientists used radiocarbon-dating technology to determine the true age of these fossils.

The Natural Habitat of Arctodus Simus

Arctodus Simus used to inhabit much of North America and parts of Northern Europe, including the regions around the Great Lakes. It preferred open grassland, wooded hillocks and meadows where it could find plenty of food. It also ranged from tundra-like areas in the northernmost parts of its range to open prairies towards the south.

In its natural habitat, Arctodus Simus could be found alongside other creatures of the Ice Age in places like the La Brea Tar Pits, a fossil-rich deposit of oil and natural asphalt. Alongside the giant bear were mastodons, mammoths, dire wolves and bison.

Appearance and Behavior

Despite its formidable size, Arctodus Simus had a relatively small head – although its teeth were larger than those of a modern-day brown bear. Its neck was also disproportionately long, allowing it to take a bear-like posture. However, its front legs were significantly shorter than its rear legs, which it used to lift its body up off the ground and appear taller when compared to modern-day bears. It also had short fur which was probably reddish or brown in color.

As far as behavior is concerned, Arctodus Simus was likely an omnivore – meaning it ate both plant matter and meat. Its numerous sharp teeth were well-suited for devouring meat, and it probably preyed upon creatures like deer and bison. Its large claws also served as an effective tool for digging up roots and tubers.

Arctodus Simus two

Interactions with Prehistoric Humans

Archaeological evidence suggests that Arctodus Simus had a sometimes-tense relationship with the prehistoric humans that occupied much of North America during its heyday. For starters, its remains are often found alongside those of extinct saber-toothed cats. This suggests that they might have had a mutually-beneficial relationship, with the cats providing the bear with a steady supply of food, and the bear lending the cats protection.

There are also several cave paintings across North America depicting Arctodus Simus, suggesting that it was an animal of great importance for these hunter-gatherer societies. On the other hand, it’s possible that the bear was a source of fear – the fact that it was so much bigger than any of the other animals in the area could have certainly been intimidating.


Like so many other creature of the Ice Age, Arctodus Simus eventually went extinct. It is believed that the primary cause of its extinction was the changing climate of the time – warmer temperatures meant that food sources became scarce, and the giant bear was unable to adapt. It is also possible that human hunting might have played a role – but this has not been definitively proven.

Today, we can still appreciate the legacy and mystique of Arctodus Simus. Its discovery and study gave us valuable insight into the megafauna of the Ice Age, and it has been immortalized in countless works of fiction and art. Its fearsome appearance and incredible size will remain indelibly in our collective memory for years to come.

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