The Common Crayfish is a freshwater crustacean widespread in eastern streams, with a mottled olive-brown to greenish body and large claws used for defense and food gathering. It is a keystone species in stream ecosystems, serving as prey for fish, birds, and mammals while itself consuming algae, invertebrates, and detritus. Crayfish excavate burrows in streambanks that are used by other species.
Best time to see a Common Crayfish
The best time to see a Common Crayfish is March–July, when about 62% of U.S. sightings happen, based on 1,575 research-grade iNaturalist observations.
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Recent Common Crayfish sightings near you
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