Sawdust from a wood-boring bee on our landlord's porch. At the top of the photo you can see the hole that's the source of all this sawdust. I just saw this bee one day and the next day I saw the sawdust and the next day he seemed to be all gone. These things are scary! I had an infestation in the eaves of my house when I lived in Illinois and I'm sure if I hadn't called an exterminator quickly they could have basically eaten the whole house. They go through wood so fast you can actually watch the sawdust fall in a steady stream from where they're boring into the wood. Can you imagine what it would feel like if they got mad and decided to go to work boring into you?