In the sky, it’s a what?

I never noticed them prior to three or four years ago, but they were nighthawks (which apparently aren't actually hawks, or any sort of raptor, despite their appearance and their name].  They migrate through Duluth every year at about this time.  Or, perhaps, almost exactly this time--the little "what you were doing a year ago" thing in my facebook sidebar today was a comment on the nighthawks arriving.

I'd guess you were seeing nighthawks...

http://lauraerickson.blogspot.com/2011/08/gazing-in-wonder-at-nighthawks.html

That's them exactly. Thanks so much PDDers.

That's an awesome link, B-Fry.

Neat link B-Fry!  If nighthawks eat mosquitos, send all of the birds to our house ASAP!

Can anyone give me the "real" name of the night hawks? It is not listed in any of my bird books and they are not shown under hawks or raptors of any kind.

Nighthawks  (caprimulgidae) belong to the nightjar family of birds, of which there are over 60 variants.

Why aren't they raptors? what makes a raptor a raptor?

I agree with emmadogs -- send those nighthawks to my place too! Even at 1 PM in the sun the mosquitoes were abundant and really fast-biting...after a summer of hardly any.

Nighthawks are in the Peterson's guide and in the Sibley guide. Peterson's says they are "aberrent goatsuckers," which sounds like fighting words to me. 

They won't be under hawks or raptors, because they aren't hawks or raptors.

Raptor specifically means a bird of prey- (it eats things bigger than bugs).