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Macroinvertebrate. The crayfish is a class 2 organism meaning it can tollerate a little bit of pollution. Its front claws are its first walking limbs called chelipeds. You can tell if it is a male or female by looking at its underside and seeing if there is a small hole or small graspers. If there is a hole it is a female.


Local streams. Lancaster County Park

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Lancaster, Pennsylvania, USA

Spotted on Oct 11, 2013
Submitted on Oct 11, 2013

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