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?

If this occurs, they’ll need to be in separate tanks. In addition, it’s best not to keep fiddler crabs in a tank with fish or ...

A salt marsh has three distinct zones: mud flat, low marsh, and high marsh. The seemingly barren mudflats, exposed only at low tide, teem with creatures like fiddler crabs, mud snails, and marine ...