There is only one species of the Bushtit seen in North America. Among the one species, there are three sub-species. These three sub-species are the Bushtit (exterior), Bushtit (interior) and the Black-eared Bushtit. Although, the Black-eared Bushtit may be seen in North America, it is more likely to be seen in the mountains of Mexico and in Central America. The Bushtits are small gray birds, that are very similar to chickadees in their appearances and their abilities of clinging to limbs and branches in every way and which way.
The Bushtits are very active birds, moving about in small flocks from tree to tree, shrub to shrub, chattering as they flit about. They are unpredictable as to when or where they will be seen next, showing up for a short spell and gone again.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.