You can watch the adults come and go and occasionally peek in for a glimpse of the females and their young clustered together-all hanging upside down, of course. Bats seem happy to move into properly built and positioned bat boxes, though it may take a few seasons. Set your bat house on the south or east side of a house or tree where it gets at least four hours of morning sunshine. Place it at least 10 feet off the ground so predators can't get at the residents. From the time you notice nest-building or denning behavior until you actually see babies varies by species.
Songbirds incubate their eggs a relatively short time.
About two weeks after the parents finish the nest and lay eggs you can expect to hear the hungry peeping of nestlings. Though great horned owls are on their eggs by February, don't expect to see owlets out of the nest until June. Coyotes and foxes begin excavating dens in the ground, usually beneath the cover of shrubs, rocks or fallen trees, in March. May. Now that you're looking, you may find a curious structure but not know whose home it is. You just might be surprised by who pops out.