October caddis don't wait for October

You see them all summer long - those little sand-and-gravel cases on the downstream side of rocks in the shallows of the stream. They might have a little black head and legs sticking out and crawl slowly across the bottom. Spook them, cast a shadow over them, and they pull their heads in, lie still and seem to disappear.

They crawl out of their cases and build new ones several times through the summer. Each case is glued together from the sand in the river bottom using a special UV-reflective protein "glue" that the little bug exudes for the purpose. When the old case doesn't fit, off it comes...

 

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