The lobster has a rigid, segmented body covering and five pairs of legs, one or more pairs of which are often modified into pincers with the chela on one side usually larger than that on the other. Lobsters have compound eyes on movable stalks, two pairs of long antennae, and several pairs of swimming legs (swimmerets) on the elongated abdomen. A flipper-like muscular tail is used for swimming; flexure of the tail and abdomen propel the animal backward.

 Crayfish are freshwater crustaceans belonging to the clade Astacidea, which also contains lobsters. In some locations, they are also known as baybugs, crayfish, craws, crawfish, crawdaddies, crawdads, freshwater lobsters, mountain lobsters, mudbugs, rock lobsters, signal crawfish, or yabbies. Taxonomically, they are members of the superfamilies' Astacoidea and Parastacoidea. They breathe through feather-like gills. Some species are found in brooks and streams, where fresh water is running, while others thrive in swamps, ditches, and paddy fields. Most crayfish cannot tolerate polluted water, although some species, such as Procambarus clarkii, are hardier. Crayfish feed on animals and plants, either living or decomposing, and detritus.

The term "crayfish" is applied to saltwater species in some countries.  

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