Male and female fiddler crabs are easily distinguished by looking at their claws. The females have small claws while the ...

This story appears in the August 2016 issue of National Geographic magazine. All around her, guys wave seductively, beckoning her to their beach homes. How will the female fiddler crab pick a mate?

Julian Huxley's very interesting results as to the fiddler-crab (NATURE, December 20 ... secreting a male hormone to a surface secreting a female hormone and remaining of constant area.

While it's not too difficult to find a little ghost or fiddler crab ... is that it contains crab roe. These semi-translucent orange orbs are egg clusters found in female crabs.