Food: The diet of the black-capped chickadee is comprised of 70 percent animal and 30 percent vegetable matter. Mast, chiefly from coniferous trees, and fruits of bayberry, blackberry, blueberry, and poison ivy make up the bulk of the vegetable matter. Animal material eaten (mostly insects) includes caterpillars, eggs, moths, spiders, and beetles. Winter diet is primarily larvae, eggs, katydids, and spiders (Bent 1946, Martin et al. 1951). Carolina chickadee _Parus carolinensis_ L 4¼″ [Illustration] Habitat: The Carolina chickadee, which inhabits the southeastern forests, is a slightly smaller version of the black-capped chickadee. In Missouri, the Carolina chickadee nests south of the Missouri River throughout the Ozarks. Nest: The nesting habits of the black-capped and Carolina chickadees are quite similar. They occasionally nest in natural cavities or deserted holes of woodpeckers, but commonly excavate their own nest cavity in decaying wood of dead trunks or limbs of deciduous trees (Bent 1946). Black-capped and Carolina chickadees line their nesting cavities with fine grasses and feathers. Food: Food habits of the Carolina chickadee are also very similar to those of the black-capped chickadee. Food consists of insects and a variety of fleshy fruits and seeds (Bent 1946). Mexican chickadee _Parus sclateri_ L 4¼″ [Illustration] Habitat: This species inhabits pine and spruce forests from 7,000 to 10,000 feet elevation just inside the United States in the Chiricahua Mountains of Arizona and the Animas Mountains of New Mexico (Phillips et al. 1964). Nest: Mexican chickadees excavate nest holes in dead trees or branches. One nest was found in a willow stub about 5 feet above the ground (Bent 1946). Food: No information on diet was found in the literature. Mountain chickadee _Parus gambeli_ L 4¼″ [Illustration] Habitat: This common little chickadee can be found in most coniferous forests of the West from 6,000 to 11,000 feet (Bent 1946). Nest: Mountain chickadees usually nest in natural cavities or abandoned woodpecker holes, and probably do not excavate their own cavities if suitable ones are available (Bent 1946). Winternitz (1973) reported five nests in live aspen and one in a dead aspen, 6 to 15 feet above ground. In Arizona, we have found five nests in live aspen, three in aspen snags, two in ponderosa pine snags, and one in a white fir snag.