Bisexual crab

Watermen say that female blue crabs "paint their fingernails," meaning the tips of their claws turn bright red as they age. The male crabs, on the other hand, have sky-blue claws -- a sign as masculine as a mustache in the world of crustaceans.

So when Robbie Watson dumped out a crab trap and found a specimen with one red claw and one blue one, the discovery stopped him.

"I set it aside for a while," Watson said. "I really wasn't sure what to think."

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