Many homeowners have found the telltale signs of the carpenter bee - nickle sized holes in their shutters and siding.
The insect: Carpenter bees are large with a shiny black abdomen and yellow thorax. They are not bumblebees. Bumblebees do not eat wood. The male is an intimidator; He cannot sting, but he will fly right up to your face. The female can sting, but normally won't unless touched.
Carpenter bees drill wood, creating a near-perfect hole (sawdust underneath). They chew the wood 1/2 inch deep and turn at a right angle, chewing for about six inches. The female lays a series of eggs in the tunnel and makes pollen "bee bread" for her larvae.