Food: The flammulated owl is almost entirely insectivorous, but it occasionally captures small mammals and birds. In the few stomachs that have been examined, items reported were various beetles, moths, grasshoppers, crickets, caterpillars, ants, other insects, spiders, and scorpions (Bent 1938). Kenyon (1947) examined the stomach contents of one owl and found 4 crane flies, 1 caddisfly, 7 moths, 11 harvestman spiders, and 1 long-horned grasshopper; the bird had apparently choked to death on the grasshopper. Hawk owl _Surnia ulula_ L 14″ W 33″ [Illustration] Habitat: The hawk owl inhabits much of the northern poplar, spruce, pine, birch, tamarac, and willow forests where such forests are broken by small prairie burns and bogs (Henderson 1919). Nest: Hawk owls usually nest in natural cavities or in enlarged holes of pileated woodpeckers and flickers. Nests have been reported in birch, spruce, tamarac, poplar snags (Henderson 1919, 1925, Bent 1938), and occasionally on cliffs or in crow’s nests. Food: This owl hunts extensively during the day and feeds on small mammals, birds, and insects (Bent 1938). Mendall (1944) examined 21 hawk owl stomachs; all contained meadow or red-backed mice; two owls had also fed on shrews. Pygmy owl _Glaucidium gnoma_ L 6″ W 15″ [Illustration] Habitat: The pygmy owl is found in most of the western wooded areas from western Canada into Mexico. It is probably most abundant in open coniferous or mixed forests and is reported specifically in ponderosa pine, mixed conifer, and fir-redwood-cedar forests. Nest: This owl usually nests in old woodpecker holes ranging in size from those constructed by hairy woodpeckers up to and including those of the flickers from 8 to 75 feet above ground (Bent 1938). Food: Mice and large insects are probably the most common prey of the pygmy owl, although other small mammals, birds, amphibians, and reptiles have been reported (Bent 1938). Brock (1958) found one vole, a deer mouse, and a Jerusalem cricket in the stomach of one bird and reported seeing another pygmy owl take a Nuttall’s woodpecker. We observed one pygmy owl in Arizona carrying a small vole. They have also been observed taking mice in the mountains west of Denver, and taking birds in the vicinity of feeders in Boulder, Colorado (Richard Pillmore pers. comm.[6]). Ferruginous owl _Glaucidium brasilianum_ L 6″ W 15″ [Illustration] Habitat: This uncommon small owl inhabits the saguaro cactus in Sonoran deserts and wooded river bottoms near the Mexican border. Nest: Nests are in abandoned woodpecker holes in mesquite, cottonwood, and saguaro cactus. Nest heights range from 10 to 40 feet above ground (Bent 1938, Karalus and Eckert 1974).