Crayfish belong to a group of arthropods known as crustaceans. This classification places them alongside other aquatic animals like crabs, lobsters, and shrimp.
Arthropods are characterized by their jointed limbs, segmented bodies, and exoskeletons made of chitin. Within the arthropods, crustaceans are primarily distinguished by their two pairs of antennae and their gills for breathing underwater. Crayfish specifically are often found in freshwater habitats, and they play a crucial role in the ecosystem as both predator and prey.