They may enter through improperly sealed or improperly screened doors and windows. The other three, though about the same size, will have a variety of different wing color patterns and are somewhat more oval in shape. Larvae of Carpet Beetles are fairly distinctive. They are quite hairy and are tan in color. There may be tail bristles visible at the back of the insect as well.
Inspection commonly reveals either live larvae or sometimes cast skins of the larvae.
It is this stage of the insect that actually ingests the food sources mentioned below. Carpet Beetle larvae may damage carpeting, clothing, hair, fur and animal hides. They will also feed on dead animal carcasses. Most homeowners spot the larvae crawling along a surfaces somewhere. They will wander about in areas away from where they feed.