Well Nighthawks are the Nightjars of the new world. They only differ slightly.
that's what i read.. i just didnt know that. i dont know much about night hawks really... since i dont see them often (i hear them at dusk and see them catching bug way up high but that's about it. i never see them land or perched)... and i never understood the 'goatsucker' thing until i looked it up today.