Every so often, a heartwarming news story tells of a shipwrecked sailor who was on the verge of drowning in a turbulent sea. Suddenly, a dolphin popped up at his side and, gently but firmly, nudged the swimmer safely to shore. It is tempting to conclude that dolphins must really like human beings, enough to save us from drowning. But wait—are dolphins aware that humans don’t swim as well as they do? Are they actually intending to be helpful? To answer that question, we would need to know how many shipwrecked sailors have been gently nudged farther out to sea by dolphins, there to drown and
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