Crayfish

Eastern Crayfish
(Cambarus bartoni) can be found in shallow stream bottoms. Normally, crayfish scuttle about near the substrate, but when disturbed they can swiftly scoot away by flicking the abdomen and tail-fans. They mostly feed on small plants, which they shred with the paired appendages near their mouths. However, they also eat aquatic insects, snails, other crayfish, and even small fish–usually after these prey are dead, since crayfish are predominantly scavangers rather than predators. Adults are most likely to be active at night, but you can find young ones scavenging during the daylight hours.