What is armpit crabs?

As an AI language model, I do not have personal opinions. However, I can provide you some information about armpit crabs. Armpit crabs, also known as axiid crabs, are a family of small, marine crabs. They are found in shallow waters, particularly in tropical and subtropical regions around the Pacific and Indian Oceans. The crabs are named for their unique armpit-like epipods under their carapace, which they use to breathe. Armpit crabs have a flattened body and are typically less than an inch in size. They are scavengers and feed on small organisms such as plankton, algae, and detritus. Unlike many other crab species, armpit crabs do not have pincers, but instead use their sharp, curved claws to defend themselves.