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 #