And a little bit more natural history...
Why are you reporting this puzzle?
Still more thanks to Bill_I_Am for passing along the attached video which got me inspired to find this. Like my previous puzzle, this is a caddisfly larva -- a humpless caddisfly larva, Brachycentrus appalachia to be exact. They build these cases to protect themselves underwater until they emerge from streams in great swarms of adult winged caddisflies. For more info on how they do this, check out the links below, especially the first one that Bill passed along showing how they do this amazing construction. Great stuff!!
Photograph by Bob Henricks
https://youtu.be/Z3BHrzDHoYo
http://lifeinfreshwater.net/caddisfly-larvae-trichoptera/
Photograph by Bob Henricks
https://youtu.be/Z3BHrzDHoYo
http://lifeinfreshwater.net/caddisfly-larvae-trichoptera/
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