Altitude also separates the Black-capped Chickadee from the (higher) Mountain Chickadee in the western mountains and the (lower) Carolina Chickadee in the Great Smokey Mountains.
Black-capped Chickadees may interbreed with Carolina Chickadees or Mountain Chickadees where their ranges overlap.
Visitors on trails may encounter Canyon Wrens, Mountain Bluebirds, Mountain Chickadees, Black-billed Magpies, and other birds.
A few birds, such as the Mountain Chickadee and Steller's Jay are commonly seen and heard in Rocky Mountain subalpine regions, with others such as owls, nuthatches and certain finches less obvious.
There are at least 107 bird species, including the Steller's Jay and Mountain Chickadee, found in the Tehachapis, many which consume acorns of the Black oak (Quercus kelloggii) as part of their diet.
Similar in appearance to the Black-capped Chickadee and Mountain Chickadee, the Mexican Chickadee can be distinguished by its longer black bib, which extends from its chin down onto its upper breast.
A few Mountain Chickadees may migrate locally up the mountains in the summer and down into the mountain foothills in the winter; but this phenomenon is not well documented.
Recent studies have indicated that in mixed flocks, Black-Capped Chickadees become dominant over Mountain Chickadees.
Animals that may be found in this zone include the Dark-eyed Junco, Mountain Chickadee, Western gray squirrel, Mule deer, and American black bear.
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