You guys must have enormous carpenter bees on the island I wouldn't know a lot about birds in your neck of the woods, but wouldn't attribute such a big hole to a bird that rat-tat-tat after worms and stuff in the holes they (insects) have made. Can you imagine how many millions of taps? The poor bird must have double vision and scrambled brains But then I may be wrong and don't have the faintest what would carve wood up like that.