Carpet Beetle

The woolly bear larva

The adult varied carpet beetle is a tiny, pretty little beetle with a scaled pattern of white, brown, and yellow. It spends its outdoor life on flowers, feeding on pollen. But the larvae — small, hairy, oval grubs called “woolly bears” — are the pest. They feed on keratin, the protein in wool, fur, feathers, leather, and dried animal products. A hidden infestation can eat holes through carpets, woollen clothing, and stored textiles over months.

Museum pest

Carpet beetles are the principal biological threat to natural history and textile museum collections worldwide. Their larvae can destroy irreplaceable specimens — bird skins, insect collections, mounted mammals, historical woollen fabrics. Museums use freezing (-20°C for 72 hours) and controlled-atmosphere treatments to kill infestations without damaging fragile specimens. Monitoring with pheromone traps is standard practice in collections care.

Lifecycle and detection

Adults emerge in spring, fly to flowers, and mate. Females seek out dark, undisturbed areas with suitable food — bird nests in roof spaces, woollen carpets under furniture, old clothing in wardrobes. Larvae hatch and feed for 1–3 years before pupating. The first signs of infestation are typically small, irregular holes in textiles and shed larval skins.

Control

Good housekeeping — regular vacuuming of carpet edges and under furniture, sealing wool garments in airtight bags, and checking rarely moved items — is the best prevention. Infested items can be frozen or dry-cleaned.