As I was watching the Thrasher fledglings on the levee last week, I heard a buzz nearby and turned to see this little hummingbird sitting on a nearby sapling. I couldn't identify it from the selection of four (Costa's, Anna's, Broad-tailed, Black-chinned) in Tekiela's Birds of Arizona Field Guide or Kaufman's Birds of the American Southwest
I sent the photos to a Birder friend, who thought that it was a female or possibly immature male Broad-billed Hummingbird. I think it's probably a female.
Following up by looking at Internet photos and also Peterson's, I wondered if it might possibly be the much rarer White-eared Hummingbird (I learned that people do mistake one for the other), but no - I think it's the Broad-billed. There's an excellent article by Larry Liese on the Tucson Audubon Society's web site that clearly distinguishes between the female Broad-billed and the female White-eared. This bird doesn't have the distinguishing green speckled throat and the stripe is greyish, rather than pure white. I'd appreciate a positive ID, if any of my readers know.