I’ve been watching a pair of yellow-bellied sapsuckers excavate a cavity in a dead white oak behind the shed. Since I’m home all the time, I can wander over and look at them whenever I feel like it, which is more often than you might expect. Sapsuckers, a kind of woodpecker, aren’t supposed to be here. They nest in northern Wisconsin, Minnesota, and Canada. In fact, according to the Wisconsin Breeding Bird Atlas, there has never been a confirmed nesting of yellow-bellied sapsuckers in my neck of