Last November, orcas sank a yacht in the Strait of Gibraltar. This wasn't anything new; these marine mammals have sunk vessels several times over the past few years. The question is why. Orcas have highly complex social structures and there's a lot we don't understand about their behavior. Can studying their interactions with boats give us some insight? Michael Weiss, research director at the Center for Whale Research, joins The Excerpt to discuss these highly intelligent and social marine mammals.

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