Bristle millipedes (likely greenhouse millipedes)

Moist leaf litter, compost, decaying wood, greenhouses, and sheltered garden soil. They often gather beneath bark, containers, or plant debris.

They graze on algae, fungi, lichens, and decaying organic matter rather than living plant tissue.

Nonvenomous and generally slow-moving, they cluster in large groups where humidity and food are high. Their detachable bristles can deter predators, and they reproduce by indirect sperm transfer.

They do not bite, sting, transmit disease, or damage healthy plants. They help break down organic matter, though large aggregations may indicate excessively moist, decomposing material.