Drain Fly Larvae (often confused with Horsehair Worms or tiny millipedes in this context)

Typically found in moist, organic-rich environments such as drains, sewage systems, decaying vegetation, and bathroom shower grouting. In the context of the image, they often appear on wet concrete or tiles.

Feeds on decaying organic matter, sludge, algae, bacteria, and fungi found in drains or stagnant water sources.

The larvae are aquatic or semi-aquatic. They wiggle actively and are often seen near the drains they emerge from. They go through a complete metamorphosis: egg, larva, pupa, adult.

Risks: Generally harmless to humans and do not bite, but can transmit bacteria from sewage to other surfaces. Large infestations can indicate plumbing leaks or serious hygiene issues. Benefits: In natural settings, they aid in decomposing organic matter.