CRABS

Crabs are decapods crustaceans ,they live in all the worlds oceans ,both on lands. They are generally covered with a thick exoskeleton and have a single pair of craw . many other alikes are kings crab, hermit crabs , crab alice etc. are not crabs.
About 850 species of crabs are fresh water , terrestrial or semi-terrestrial species they are found through out the worlds tropical and semi-tropical regions.