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Posted in Caterpillars Worms Facts Worms Generally

Caterpillar on Window Screen in Illinois is an Ilia Underwing Moth Caterpillar

A woman discovers strange-looking worm on her window screen in Illinois and wonders what in the world it is. From the image sent in below, the worm appears to be brown or gray in color, with a grainy texture/pattern that makes it resemble tree bark.