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unknown
A very small hawk of some sort.
Seems to prefer nesting on those hot rocks here in the Lower Rio Grande Valley.
I'm no good at telling the nightjars apart, but pauraque's and poorwills are much more common in south TX. I've never heard or seen nighthawks in south TX, though it is at the very extent of their breeding range.
I agree with Nightjar. Certainly not a Hawk, nor a Nighthawk whose wingtips would be well beyong the tail when resting like this, and has clearly visible white patches on the wings and throat.
This is not a hawk, it is in the nightjar family. Also, please refrain from putting anything in the scientific name field other than a scientific name, thanks!