Woodworm (common furniture beetle) are small brown beetles approximately 3mm to 4mm long. The adult does not feed, it’s only purpose is to reproduce. A female lays eggs in timber, which in turn hatch into larvae.
These larvae eat the starch part of wood creating the tell-tale tunnels that indicate an infestation. Usually this is not noticed until May when the larvae have pupated and emerge through small holes as adults. The hole is typically 1mm to 1.5mm diameter and often there are traces of dust in and around these fresh holes.