The Black Fly is a tiny, hump-backed biting fly notorious for swarming in enormous numbers around people and animals in northern forests during late spring and early summer, making outdoor activity miserable in some regions. Females cut skin to feed on blood, causing intensely itchy welts. Larvae filter-feed attached to rocks in fast, clean streams and are important food for fish.
Not certain it is a Black Fly? What bug is this? walks through what to check first and the lookalikes that catch people out.
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