Gulo gulo (Linneaus 1758; up to 110 cm in length) is the extant wolverine, a ferocious predator resembling a small bear. Here it nests with Arctodus, the short-face bear at the base of the higher Carnivora.

Arctodus simus (Leidy 1854; Cope 1874; up to 3 to 3.7m tall) is the extinct short-faced bear, one of the largest terrestrial mammalian carnivores of all time. Long limbs made it a fast predator. The two species can be clearly separated based on the relative proportions of their molars and premolars. Here it nests with Gulo, the wolverine, in the LRT.