How do male fiddler crabs attract female crabs?

Male fiddler crabs attract females by waving their large claw. This is a mating display that is used to show off their strength and fitness. The size of the claw is thought to be an important indicator of male quality, and females are more likely to mate with males with larger claws.

In addition to waving their claws, male fiddler crabs also use pheromones to attract females. These pheromones are released from the male's body and are thought to help females identify potential mates.

The combination of waving their claws and releasing pheromones helps male fiddler crabs attract females and reproduce.