Biology: American lobster

It is a species of lobster found on the Atlantic coast of North America. Within North America, it is also known as the northern lobster, Atlantic lobster or Maine lobster. It thrives in cold, shallow waters where there are many rocks and other places to hide from predators and is both solitary and nocturnal. It feeds on fish, small crustaceans, and mollusks.

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At first the claws of a lobster are identical, but with use the lobster will start to favor one over the other. The favored claw will get bigger and be filled with primarily slow-acting muscle tissue which cannot react quickly, but does not tire quickly. This is the crusher claw. The other claw, the pincher, will develop fast-acting muscle tissue useful for grabbing prey quickly.

Sources: Wikipedia