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acorns animal matter ants areas Arizona aspen Bailey and Niedrach Barn owl Beal beetles Coleoptera Bellrose berries bluebird boreal breeding Brown-headed nuthatch Bull Carolina chickadee caterpillars cavity-nesting birds Coleoptera common conifer cottonwood crevices Cricetidae crickets dead trees diet Douglas-fir Dover Publ Eastern bluebird eaten entrance hole excavate feed feet above ground flicker forest types fruits goldeneye grasshoppers Habitat Hairy woodpeckers Hemiptera histories of North Hymenoptera inches insects Karalus and Eckert Kilham larvae Lepidoptera live trees mergansers mesquite mice moths natural cavities nest boxes nest in cavities nest in natural nesting cavities nesting sites North American nuthatches old woodpecker holes Orthoptera pecker percent animal Pileated woodpecker pinyon-juniper ponderosa pine ponderosa pine snags prefer purple martin red-cockaded woodpecker reported Rodentia saguaro cactus sapsucker seeds species spiders spruce stomachs sycamore titmouse U.S. Natl violet-green swallows warbler weevils western Wildlife willow winter wood ducks woodlands woodpecker Habitat wrens