Re: explain this one

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Looks like a Robber Fly to me, but I didn't verify by looking it up in a text.  Robber Flies resemble giant mosquitoes a bit, and they are indeed blood suckers, but they generally catch other critters, mostly flying insects that they mostly grab right out of the air on the fly, then suck them dry).  Looks like a rather small one; they are often well over 1 inch long; there are lots of species.

 

Dave