It goes straight through the wood. I could see how it might have been done by a woodpecker.woodpecker?
usually, although sometimes they do it for other reasons.Wood pecker no doubt
I've seen them attack new decks. Of course I'm assuming if it is them there must be insects in the wood too.
They sure do. OP that's from a Woodpecker.Carpenter bees here drill precision holes..
I just talked to a guy who works construction. He thinks it's woodpeckers looking for larvea.