This hellgrammite seemed to think it could escape by moving rocks around, so it was picking up surprisingly large pieces of gravel and throwing them back over the top of its head.  It was really cool to watch and I wish I had got it on video, but it gave up too quickly.  Corydalus (Dobsonflies) Hellgrammite Larva from Paradise Creek in Pennsylvania
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This hellgrammite seemed to think it could escape by moving rocks around, so it was picking up surprisingly large pieces of gravel and throwing them back over the top of its head. It was really cool to watch and I wish I had got it on video, but it gave up too quickly.
Corydalus (Dobsonflies) Hellgrammite Larva from Paradise Creek in Pennsylvania

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