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What's more, they're biologically predisposed to eating a lot of crabs, she said. "Sea otters rely on fur for insulation as opposed to seals, which rely on blubber.

An earlier version of this story said researchers found a single otter can consume between 50,000 and 120,000 crabs a year. In fact, that figure is for the local population of otters, not just one.

NPR's Juana Summers speaks to researcher Rikke Jeppesen about her work on how sea otters, which were hunted to almost near extinction, have been able to thrive by eating up to 120,000 crabs a year.