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Horsehair worms (Nematomorpha) seen after a rainfall in Toronto, Ontario, Canada, on May 29, 2025. Horsehair worms are also known as hairsnakes, or Gordian worms. The adult worms are free-living, but the larvae are parasitic on arthropods, such as beetles, cockroaches, mantises, orthopterans, and crustaceans.
Horsehair worms (Nematomorpha) seen after a rainfall in Toronto, Ontario, Canada, on May 29, 2025. Horsehair worms are also known as hairsnakes, or Gordian worms. The adult worms are free-living, but the larvae are parasitic on arthropods, such as beetles, cockroaches, mantises, orthopterans, and crustaceans.
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