A young bottlenose dolphin bursts like a rocket out of the waves. Stuck on the end of his beak is a large sea sponge. "He just took off, swimming fast, with his mother right on his tail," says Janet Mann, a psychologist and biologist. "You could almost hear her yelling, 'Give me back that sponge, you little squirt!'"

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Text by Aline Alexander Newman
Photograph by Stuart Westmorland / Danita Delimont Agent
Video courtesy National Geographic Television