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Posted in Drain Fly Larvae Worms Facts Worms Found in the House

Worm-like Critters in Cat Fountain are Drain Fly Larvae

“I found these worm-like critters living in my cat’s automatic waterer”, writes Linda about the black creatures pictured below. “What are they and where did they come from?” Based on the excellent photo and the context that Linda provided us, we think she found drain fly larvae in the waterer. Drain fly larvae are harmless to humans and cats, but can be quite a nuisance. As their name suggests, they are found near or inside drains, as the adult flies lay their eggs on the organic film that forms in the lip of a drain. They do this because the diet of the larvae largely consists of the organisms that grow in stagnant water, like algae and fungi, as well as microorganisms.