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Here is one I prepared earlier..... :) He was zipping around and I got lucky again(looks different to my previous post) but I did see a lot and they all looked different to each other except for a glimpse of a ruby throated that I wasn't able to capture. Thanks, FB

Based on the size of the citrus bloom it is sipping nectar from, the species ranges for fall/winter, and the field marks I can see, my guess would be your photo is of an immature Anna's Hummingbird.

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"Watch the birdie."
Latest: Sage Thrasher, Ferruginous Hawk (Dark Morph).

There are not enough diagnostics on this bird to determine age or sex.  Per Williamson both immature males and females look like mom.  Clear tail shot would be a clincher.

If you are interested, here are some Anna's tails and their associated maturity.

http://www.whatbird.com/forums/forums/post/86917.aspx

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Latest Birds: Black-throated Green Warbler, Pine Warbler, Eastern Kingbird, Rufous-backed Robin, Crissal Thrasher