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Empidonax traillii
There are four subspecies of the willow flycatcher currently recognized, all of which breed in North America (including three subspecies which breed in California). Empidonax flycatchers are almost impossible to tell apart in the field so biologists use their songs to distinguish between them.
Urban nature park
Unfortunately, the bird is half hidden by a branch but it was my only chance for a photo and I hadn't seen this bird before.
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