Caddisfly Larva (in case)

Lakes, rivers, streams, and ponds worldwide

Detritivore; eats decaying plant matter, algae, and occasionally smaller microorganisms

The larvae build protective silk cases reinforced with sand, pebbles, or plant debris. They live underwater until pupation and emergence as flying adults.

Harmless to humans; valuable ecosystem indicator of water quality and a vital food source for fish.