Open country, grasslands for A. simus; also, alpine glacier terrain at fairly high elevation. One Arctodus simus site is in the Wasatch Mountains in central Utah at 9000 feet in elevation, and is associated with a Columbian mammoth. (Gillette & Madsen 1992, 1993)
A. pristinus occupied more forested regions of the eastern North America.
Gillette & Madsen (1992, 1993)
Kurtén & Anderson (1980)
Scott & Cox (1993)