Isn´t there a slight greenish-yellow tone to the secondaries and the breast side, at the bend of the wing, lacking in Plumbeous (perhapas except in fall birds when fresher and brighter) and indicating Cassin´s. It could however be a light effect.
JanJ
Can anyone help me identify this bird? The shot was taken in mid-may, in Denver Colorado. He/she was flitting around the Locust tree in the backyard along with a couple of bushtits. Thank you!
I live in Boulder, Colorado. I've recently (only on two occasions, and never previously) seen a tiny, slim, two-tone grey bird at my birdfeeder (in December, cold weather). Smaller than a mountain chickadee ... about the size of a hummingbird, but not a hummingbird ... fairly thin beak, and not long. Somewhat similar to the image in the original posting, but I THINK there were few if any distinct markings on the wings (or anywhere else). The two tones of grey were neither real dark nor real light grey. Anyone know what it was?
Not sure if you get them in winter in Colorado but you might look at some pictures of
Ruby crowned Kinglet
IMO the bird is clearly a Plumbeous Vireo.
Look up Bushtit. No titmouses occur in Boulder Co. (except as vagrants).
The main problem with Blue-gray Gnatcatcher is that they depart the state before the end of October. As they're obligate insectivores, they don't survive well in sub-freezing temps and lots of snow.