Crayfish
A freshwater crustacean that resembles a small lobster. They are commonly found at the bottom of streams, rivers, and lakes. Crayfish are omnivorous, feeding on plants, insects, and small fish, and are most active at night.

Also known as: crawfish, crawdads, freshwater lobsters, mudbugs, or yabbies.

https://en.m.wikipedia.org/wiki/Crayfish