Among the most compelling anecdotes suggesting that dolphins have concepts of ‘wrong’ behavior is Thomas White’s description of how a human snorkeler observing Atlantic spotted dolphins off the Bahamas went outside the bounds of the norms of behavior expected by the dolphins of human observers at that site. The swimmer approached a calf engaged in learning to fish with its mother, a no-no in the rules of engagement between swimmers and these dolphins built up over years. When this happened, the mother then swam not to the hapless trespasser but to the leader of the group of swimmers, whom she could identify, and tail-slapped, her displeasure apparently directed at the leader who had not controlled the behavior of those being led.

— Hal Whitehead and Luke Rendell, The Cultural Lives of Whales and Dolphins, 2015