Above: A cross-section of part of a burrow of a Carpenter Bee.

Here you see a Carpenter Bee hole above the gutter and below the roof drip edge, also notice the sawdust just below.  They drill holes usually around the roof-line above the gutter or hidden in such a way that you can't see it from the ground.

(click on the picture above) Clearer picture of a Carpenter Bee Hole that also shows excrement that has been pushed out of the hole.

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