Black-tailed Gnatcatcher, Polioptila melanura
			The Black-tailed Gnatcatcher of the southwest desert is distinguished from the much more common and widespread Blue-gray Gnatcatcher by a mostly black undertail; this can barely be seen in the profile photo above, but on the left is a detail from another shot of the same bird, showing the undertail more clearly. The dark mark over the eye is also a distinguishing mark, found on the non-breeding Black-tailed male, but not on the Blue-gray.