I am notoriously poor at i.d.ing birds from photos. And, as Linda Williams noted, not all pixels are equal.
That said, I've seen a lot of Cassin's Kingbirds. The photos do not appear to me to support Cassin's. When you return, really try to get good photos of
1. The head/malar/chin/breast. Cassin's have (compared to Western) very dark gray in breast, throat, chin, which really highlights the white malar area. (this appeared too diffuse/non-contrasty to me in the photos)
2. The wing coverts: light edged in Cassin's; dark in Western
3. That tail! Try for definitive shot of white terminal band for Cassin's; white outer feathers for Western.
Bodacious birding--and photographing,
On Jul 26, 2009, at 10:20 AM, Christine Kline, Secretary wrote:
I have some photos of the bird's backside which to me, showed an olive-green
presence. According to Peterson's field guide, this supports Cassins?
Additionally, we also saw one of three that had yellow on the belly and the
breast. I will try to go back today or tomorrow to take notes. I'll also
post a couple of more pictures this evening.