A new study published in the Journal of Comparative Psychology has documented something extraordinary in the animal kingdom: wild killer whales repeatedly offering food to humans. In all but one incident, the whales lingered after the offering, as if waiting for a response. According to Towers, food sharing among orcas is a prosocial activity—a way to build and maintain relationships within their pods. Killer Whales Are Giving Fish to Humans. Orcas also often hunt prey much larger than themselves, such as large fish or marine mammals, leaving them with excess food.