Do lobster eat other lobsters

Actually, crabs eat anything. Many crabs find food by sifting through the sand and eating any little particles they can find that taste good to them - this is why you see them sitting around on the beach picking at the sand with their claws. Crabs will also eat anything in the water or on the beach if it is dead, also - that includes dead crabs. Many crabs hunt other animals like bivalves, gastropods, shrimp, and yes, other crabs.