Two-spotted Carpet or Fur Beetle Attagenus pellio

The Fur Beetle, also called the Two-spotted Carpet Beetle is a small (4-6mm long), oval, black or dark brown beetle with a white spot on each wing case and a light scutellum.

Like other Carpet Beetles, its job is to recycle debris. The adult lives mainly outside but the female flies in to houses (and outhouses/storage and birds' nests) to lay eggs and it is the larvae, below, which do extensive damage to natural fibres, including furs and textiles. (Attagenus unicolor looks similar, including the "bat" antennae, but without the white spots.)

Two-spot beetle larva with its extensive tail.