Boreal Owls prefer mixed spruce_hardwood forests, while Saw_whet Owls prefer to nest near the edge of spruce or deciduous forest groves. Woodpecker nest boxes should be placed 6┰ feet above the ground, though Hairy Woodpeckers prefer nest sites 12 feet or more above the ground. Common Flickers nest in open areas and open park_like areas, while Hairy and Downy Woodpeckers prefer open deciduous forests.
Snags provide "hawking" perches for flycatchers and resting perches for swallows. Flycatchers perch on a branch, fly out to snatch insects, and then return to the same branch to watch for other insects. Large natural cavities, formed in snags by decay, often provide homes for a variey of mammals including marten, porcupine, bats, bushy_tailed woodrats, northern flying squirrels, and other species. When left to decay and fall over naturally, large hollow snags may provide den sites for larger animals like mink, lynx, red fox, and wolverine. To help provide homes for this wide variety of animals, leave dead trees standing whenever possible, particularly snags larger than 6 inches in diameter and/or any containing woodpecker holes or other cavities.