Shy Crabs Make the Most Sperm

A fellow who hides in his shell until danger has passed may not seem like the epitome of manliness. Yet among hermit crabs, the shyest males have the most to offer the ladies. It’s all part of their evolutionary strategy. Crabs that are long on bravery, meanwhile, are short on sperm.

Mark Briffa, an animal behavior professor at Plymouth University in the United Kingdom, and his colleagues found the surprising connection between sperm and shyness while studying “life history” in crabs. To

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