The Social Life of Bull Sharks Is More Complex Than You Think Fin to fin, these two bull sharks glide through the water: In front swims the powerful "Chunky," closely followed by the younger "Lady Lazarus." The two predators are apparently not just members of their own species, but something like friends. For a long time, sharks were considered solitary hunters and loners without social bonds. But new observations show that they repeatedly seek out certain members of their sp