dunno if it was a nighthawk, and it was mid-afternoon...
we saw a critter in our backyard, that looked sorta like this
except it had a grey chest.
it was perched on the flat roof of a neighbor's garage.
it had a pigeon under its claws, and was in the process of killing it.
then it clumsily flew away with its prey, leaving a couple of pigeon feathers to flutter.
pretty amazing site to see up close...