Small dark winged fly (possibly a drain fly or fungus gnat)

Often found indoors near drains, damp organic matter, houseplants, or moist soil. Exact habitat depends on the species.

Adults may feed on organic fluids, while larvae consume algae, fungi, bacteria, or decaying organic matter. Some adults take little or no food.

Weak fliers commonly rest on walls or windows and may appear in bathrooms or around plants. Larvae develop in moist films, potting soil, drains, or decaying material.

Generally harmless and do not bite; large indoor populations indicate excess moisture or organic buildup. Larvae help decompose organic matter, though some fungus gnat larvae can damage young plant roots.