I really do think the Pileated Woodpeckers are making holes for their nest. Every time I walk I see them working on this same tree. Today I saw both of them working on holes. There are two, one about three feet above the other. The female was working on the bottom one. The male the top. They were not working at the same time. The male's hole is so big he can go completely inside and work. Here he is peeking his head out and tossing sawdust out of the hole. Press "L" to see him more closely. I am quite excited that the mother may lay her eggs there and they might raise their young in that tree. I intend to check it regularly to see what they are up to.