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  1. How Crabs Live in Different Environments
    How Crabs Live in Different Environments
    Crabs are decapod crustaceans of the infraorder Brachyura, which means they have 10 legs and a short tail. They are among the most diverse and successful animals on the planet, living in all kinds of habitats.
    Description

    Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin. Behind their pair of chelae (claws) are six walking legs and then two swimming legs. The crab breathes through … See more

    Environment

    Crabs are found in all of the world's oceans, as well as in fresh water and on land, particularly in tropical regions. About 850 species are freshwater crabs. See more

    Sexual differences

    Crabs often show marked sexual dimorphism. Males often have larger claws, a tendency that is particularly pronounced in the fiddler crabs of the genus Uca (Ocypodidae). In fiddler crabs, males have one greatl… See more

    Life cycle

    Crabs attract a mate through chemical (pheromones), visual, acoustic, or vibratory means. Pheromones are used by most fully aquatic crabs, while terrestrial and semiterrestrial crabs often use visual signals, su… See more

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