Horsehair Worm

Scientific Name: Nematomorpha

Order & Family: Order: Gordioidea; Family: Gordiidae

Size: 5 to 10 centimeters long on average, though they can reach up to 1 meter in length.

Horsehair Worm

Natural Habitat

Mainly freshwater environments such as streams, ponds, and puddles; some are found in damp soil.

Diet & Feeding

Adults do not eat; larvae are parasites that consume the tissues and fluids of hosts like crickets and beetles.

Behavior Patterns

They are parasitic during larval stages and free-living as adults. They are famous for 'mind-controlling' their hosts to jump into water so the adult worm can emerge.

Risks & Benefits

Harmless to humans, pets, and plants; they provide an ecosystem benefit by controlling populations of insects like crickets and grasshoppers.

Identified on: 3/12/2026