Night hawks are pretty neat; have you seen some of their feathers? I think think its every feather.. but some of their feathers have small little spines that catch air and as they dive help to make those humming noises... anyone know what I'm talking about?
I'm not sure if it was an adaptation to confuse/stun prey or for mating or to scare other critters off... perhaps someone else on here has more insight?
In any case, cool shot.

generally they nest/roost close to the ground, so its neat to see them in vegetation like that!