Tamaulipas, Mexico 2006
This silent Empidonax flycatcher was near the Research Station at Rancho del Cielo:
In the field it "felt" more like a slightly grayish Western-type, but examining these pics it looks more like a Hammond's - except that the bill does not look right.
Can Hammond's have a bill like this?:
Note that the wing-tip extends well beyond the tips of the longest undertail coverts: