Arctotherium is an extinct genus of giant bears that lived during the Pleistocene epoch, primarily in North and South America. These massive creatures are known for their impressive size, with some species, like Arctotherium angustidens, being among the largest terrestrial mammals ever, weighing up to 3,500 pounds. Fossil evidence suggests that Arctotherium primarily inhabited open grasslands and forests. They were omnivorous, feeding on a varied diet that included plants, fruits, and possibly small animals. Their extinction is believed to be linked to climate change and the arrival of humans in their habitats.