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hermit crabs

Hermit crabs have odd ways of preventing theft and finding new homes…

The hermit crabs learned to move into the shells of dead crustaceans, and their well-being depends on that movable property. Recent research suggests that they have made some unusual efforts, as species, to hang onto the desirable shells: Over the course of evolution, penis size has been subject to female choice and competition with male rivals. In a study published today (January 16) in Royal Society Open Science, Mark Laidre, a biologist at Dartmouth College, introduces a new idea: that larger penises help animals keep hold of precious resources. He compared hundreds of specimens of nine related species of hermit crab and showed that crustaceans that have more valuable shells have longer sexual tubes, helping them keep a grip on Read More ›