What Jorn, Todd and Mike said...carpenter bees. They like to he on the bottom of horizontal surfaces, they can bore 4' long holes and they return to...
They eat plenty and don't stay this size for long. Last summer whole hillsides were brown because none of the trees had leaves. The caterpillars area...
If you are in the NE and wondering why the foliage is taking so long to fill out, the reason is likely these guys. There are tons, way more than last...