crab

A crab is a crustacean characterized by a broad, flat body covered by a hard exoskeleton called a carapace, and typically five pairs of legs, with the first pair often modified into claws. They congregate in marine, freshwater, and terrestrial environments. Crabs are omnivores, feeding on plants, small animals, and detritus. Their exoskeleton provides protection, but they must molt periodically to grow. Crabs play important roles in ecosystems as scavengers and predators. Their diverse forms and behaviors make them fascinating subjects of study in marine biology.