 It can be distinguished from the similar smalltooth sand tiger ("O. ferox") by its teeth, which have only one lateral cusplet on each side, and by its uniformly dark brown color.Inhabiting continental margins and oceanic waters at depths of , the bigeye sand tiger may make vertical and horizontal migratory movements.It feeds on bony fishes and squid, and its sizable eyes and dark coloration suggest that it may spend most of its time in the mesopelagic zone.