Depending on the species and size of the crab, eating habits vary. Blue crabs eat many different kinds of food, including fishes, oysters, clams, shrimp, snails, worms, and other crabs. At high tide, they may go on the shore and grab snails from the grass. At low tide, they might burrow in the sand and wait for a fish to swim by. Blue crabs are mainly opportunistic feeders, which means that they will eat mostly whatever’s available.
It depends on the species of crab, but a large majority of crabs are scavengers that eat dead plants and animals. Check out the link for more information.
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