I shot this photo of an immature verdin, difficult to capture as she flitted around in the coral pink yucca flowers at an eastern ASU entry corridor. Young verdins are plain gray all over. I wouldn't have known she was a verdin by her color, I relied on her size (just a little bigger than a hummingbird) and behavior - she was active and flitting and sounding a call that is familiar to me (I love when these little birds visit my Palo brea tree). Adults have yellow heads and rufous-colored shoulder patches. A very attractive little native bird, found in the southwest U.S. and Mexico.