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Cray fishes are a kind of crustacean that lives in freshwater and is a member of the group Astacidea, which also includes lobsters. In certain areas, they are also referred to as crawfish, craydids, crawdaddies, crawdads, freshwater lobsters, mountain lobsters, rock lobsters, mudbugs, baybugs, or yabbies. Other names for them include mountain lobsters, rock lobsters, and freshwater lobsters. As far as their place in the tree of life is concerned, they belong to the superfamilies Astacoidea and Parastacoidea. They take in air via gills that look like feathers. Others flourish in wet environments such as marshes, ditches, and paddy fields, but some species may be found living in flowing freshwater such as brooks and streams. The vast majority of crayfish are unable to survive in dirty water, but certain species, such the Procambarus clarkii, are more resistant. Crayfish consume dead or decaying animals and plants, as well as debris, for food.