The verdin (Auriparus flaviceps) is a species of penduline tit. It is the only species in the genus Auriparus and the only species in the family to be found in the New World.
immature - note red shoulder patch - gray/yellow head
The verdin is a very small bird. At 4.5 in (11 cm) in length, it rivals the American bushtit as one of the smallest passerines in North America. It is gray overall, and adults have a bright yellow head and rufous "shoulder patch" (the lesser coverts). Unlike the tits, it has a sharply pointed bill.
Sexs alike - adults have bright yellow heads

Verdins are insectivorous, continuously foraging among the desert trees and scrubs. They are usually solitary except when they pair up to construct their conspicuous nests. Verdins occasionally try to obtain tidbits of dried sugar water from hummingbird feeders. They also feed on fruit.

Verdins are permanent residents of the southwestern United States and northern Mexico, ranging from southeastern California to Texas, throughout Baja California and into central Mexico, north of the Trans-Mexican Volcanic Belt.
Moves actively and nimbly among limbs of scrub vegetation, in a manner resembling that of chickadees. Often holds blossoms with feet while looking and picking at prey with bill.
immature - head just starting to turn yellow
The nest is large sphere (football sized) with a hole usually located near the bottom. Outer shell of sticks, lined with leaves and smaller twigs. Placed in shrub.