Crabs

Crabs are crustaceans, they have a hard exoskeleton, five pairs of legs and two sets of claws. Crabs are usually found in oceans and other bodies of water. They are a major source of food for many species, including humans. They are also used as a source of bait for fishing. Crabs play an important role in aquatic ecosystems by scavenging for food and serving as both a predator and prey. They are also important in the food chain, providing sustenance for many animals, such as stingrays, turtles, and larger fish. Crabs have been used medicinally as a traditional medicine in China, as well as studied as a source of possible antibiotics. In addition, they are popular in the aquarium hobby and provide an interesting alternative to the traditional fish tank.