Drain fly

Damp, moist environments near organic matter such as sink drains, sewers, bathrooms, and septic tanks.

Larvae feed on decomposing organic sludge, algae, bacteria, and fungi; adults feed on flower nectar and polluted water.

Weak fliers that move in short, erratic hops; nocturnal, attracted to light, and commonly found resting on walls near damp drains.

Harmless to humans as they do not bite or transmit human diseases, but can become a nuisance pest indoors; larvae help break down organic matter in drains.