The Amazing Inner Lives of Animals

One clan of killer whales eats only a single species of salmon. Another kills only one species of seal. When members of a mammal-eating clan were captured for the aquarium trade in the 1970s, they starved themselves for seventy-eight days before eating the salmon being proffered, and then they ate the fish only after they had performed a strange ceremony. The two whales held gently onto either end of a dead salmon, and swam a single lap around their pool with it in their mouths, before dividing the fish between themselves and consuming it.
— Tim Flannery (based on work by Hal Whitehead and Luke Rendell)