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Illustration of pollution tolerant species. At top are pollution intolerant species: stonefly, riffle beetle, mayfly, right handed snail, and caddisfly. In the middle are somewhat tolerant species: scud, sowbug, crayfish, damselfly larvae, dragonfly larvae, clam. At bottom is pollution tolerant species: leech, blackfly larvae, aquatic worm, left handed snail, midge larvae.