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acorns animal material ants areas Arizona aspen Bailey and Niedrach Barn owl Beal beetles Bellrose berries bluebird boreal breeding Carolina chickadee caterpillars cavity-nesting birds Condor conifer cottonwood Cricetidae dead trees diet Douglas-fir Downy woodpecker Eastern bluebird eaten entrance hole excavate feed feet above ground flammulated owl flicker flycatcher food items forest types fruits goldeneye grasshoppers Habitat hairy woodpeckers Hamerstrom house sparrow inches insects Kilham larvae Ligon live trees major food mergansers mesquite moths natural cavities nest boxes nest holes nest in cavities nest in natural nesting cavities nesting sites North American nuthatches old woodpecker holes pecker percent animal percent vegetable peregrine falcon pinyon-juniper ponderosa pine prefer purple martin red-cockaded woodpecker Rodentia Cricetidae saguaro cactus sapsucker seeds species spiders spruce starlings stomachs swallows sycamore titmouse U.S. Dep U.S. Natl usually vegetable matter warbler western Wildl Wildlife willow Wilson Bull winter wood ducks woodlands wren yellow-bellied sapsucker