In February I was doing my typical top down fire with two small chunks N/S as sleepers and two larger splits E/W. Three smaller diagonal splits on top with some kindling and pinecones to get things started. After if got going a bit I heard buzzing in the wood from one of the larger splits. I shut the door. I was surprised since I thought it sounded like a bee or carpenter bee and could it be wintering over. Never heard that sound before even in the stoves we had in my folks house.