What’s the purpose of the Atlantic Sand Fiddler Crab’s giant claw? Museum Keeper Jason explains that for male fiddler crabs, the oversized claw makes up over half their body weight and works as a weapon, a warning, and most importantly a billboard for romance. Standing in front of his burrow, he waves it back and forth to attract a female. If he loses it, he can grow a new one after several molts. It’s usually weaker, but since showing off matters more than strength, he manages just fine. #Zoo #

A female ring-legged fiddler crab watches as two rival males vie for her attention by showing off their strength, and the size of their appendages. One is clearly outperforming the other—but will she be interested in either? Tune in to Island of the Monsoon, tonight at 8/7c! | Smithsonian Channel

Just saying hey 👋🦀 These male fiddler crabs use their oversized claw to dig, duel, and call the ladies into their burrows. | National Geographic Animals