Bear Know

Crab is a beast of decapod crustaceans from infraordo Brachyura, which is known to have a “tail” is very short, her stomach was totally hidden under the chest. Crabs are protected by a very hard outer skeleton, comprised of chitin, and armed with a pair of tweezers. And blue swimmer crabs are also included in infraordo Brachyura. These animals live almost all the oceans of the world, for land crabs usually live in the tropics.

Crabs have the five pairs of legs, claw-shaped pair of first leg, this leg is not used for the move, normally used tweezers to grab the food, other than to reach for food, capii used to conduct the defense or to defend themselves from attack. In almost all kinds of crabs, accept a few only, abdomen folded under the cephalothorax. Crab’s mouth parts covered by the maxilliped is flat, and the front of the carapace does not form a long rostrum.  Crabs keep breathing with gills in a way to condition himself to stay moist and can bind oxygen in the process of breathing. Crab gill plates are formed from a flat “phyllobranchiate”, similar to the gills of shrimp, but with a different structure.