Crayfish, also known as crawfish or crawdad, are freshwater crustaceans that resemble small lobsters. They typically inhabit rivers, lakes, and ponds, where they hide under rocks or in burrows. Crayfish have a hard exoskeleton, two large pincers, and a segmented body, which helps them move and catch food. These creatures are omnivorous, feeding on plants, insects, and detritus. Crayfish play an important role in their ecosystems by helping to recycle nutrients and serving as food for various animals, including fish and birds. They are also popular in culinary dishes, especially in southern United States cuisine.