It is due to the fact that it contains a clotting agent, important in medical field to make LAL – Limulus Amebocyte Lysate. Their blood is in high demand with a hefty price tag. ![]() That comes from hemocyanin – the metal copper in their oxygen-transporting proteins. Horseshoe-crab blood has a distinct blue color. Instead of iron, it uses copper to carry the oxygen. It is just that their blood is different from human and animals. Those legs, with the leg joints bend outward move fast and efficiently sideways.Ĭrab’s flat body and its flexible legs make it easy for them to squeeze into narrow space or bury under the sand. They have multiple legs on the side of their body. Why can’t crabs walk forward?Ĭrabs do not walk forward because their body are born to move sideways. Then, they use the small rearmost legs to move it out of their shells. You can hardly notice that as crabs secrete a very small amount each time.Ĭrabs excrete its solid waste from an anus at the end of the abdomen inside the shell. Do crabs pee out of their eyes?Ĭrab’s urine release area is at the base of the antennules. But it is important that we care more and more about them. We need more studies to know for sure how crab or other crustaceans feel pain. Researchers have found out that crabs not only feel pain but also can hold a memory about it ( Science Daily) They have good senses of sight, smell and taste. Yes, crabs can detect, feel and react to pain. But it has the cognitive capacity for complex learning. If compare neuronal count, crab brain is about 10 time smaller than a bee’s brain. While the ventral ganglion is between its legs, beneath the internal organs.Ĭrab’s brain is tinier than many small animals. Its dorsal brain locates between the eyes and the anterior end. It has dorsal ganglion and a ventral ganglion, connected by a circumesophageal ganglion. It has a different nervous system from that of mammals, birds or fishes. ![]() The ventral ganglion provides nerves to crabs’ walking leg and sensory organs. What types of crabs can live with fish?Ĭrab has a tiny brain that process sensory inputs from its eyes.
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