Horsehair worms are very long (4 to 14 inches) and very narrow in diameter (1/25 to 1/16 inch wide). They may also be found on damp garden soil or vegetable plants after rain. The horsehair worms are interesting threadlike roundworms that resemble the "hair of a horse's tail or mane." These long, active worms may be observed in streams and ponds during late summer or fall but are more commonly noticed in domestic water containers such as bird baths, swimming pools, water troughs, pet dishes, sinks, bathtubs, and toilets. They are harmless to plants, people, and pets.Horsehair worms are mildly beneficial because a small percentage of crickets, grasshoppers, and other insects are infected and killed.Horsehair worms are also called Gordian worms because they resemble the "Gordian Knot" of ancient Greek legend.
Long and slender parasitic roundworms of crickets and other large insects are occasionally present in pet dishes and other water containers.
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