Rare for the LRGV, a Hammond' Flycather

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This Hammond's Flycatcher was identified yesterday at Estero Llano Grande State Park in Weslaco, TX by Mary Gustafson with some notes that this bird has been around for a month (I guess the bird matches some photos taken last month but identified as another species).
There are very small differences between Hammond's and Dusky Flycatcher and similar to other empids. This bird wagged it's tail upwards which rules out Gray Flycatcher that wags it's tail downward. Sibley notes that Dusky has a rounded head and this bird shows a flatter head.  Sibley also differentiates Dusky and Hammond's by primary projection with Dusky having a short projection and Hammond's a long projection. Not visible in pics but I looked at the bird 's back and had the impression of a long primary projection. Sibley also states that Hammond's have a "distinct 'vest'" and all 3 of these shows a vested appearance. But I am glad there have been no other flycatchers seen at this location and a highly skilled birder did the initial identification. SeEtta

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