Collecting bottles, tossing leftovers, taking out the garbage
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Carl Safina lives in Long Island, New York, with his wife, Patricia, two dogs, some chickens, a couple of parrots, and a king snake.
Dolphins who hear their own signature whistled by another dolphin call back. They don’t respond to a dolphin who whistles a third dolphin’s signature call. In other words, they call each other by name, and they answer when they hear their own name called. Dolphins call their close friends’ names when they are separated. No other mammal seems to do that (that we know of).