Night Eagles: will they survive in Alaska's tundra when the time of POLAR CITY RED comes true?

While waiting to get seated, I heard a strident screech above (listen here). I looked up and saw two Savanna Nightjars circling overhead. Quite impressive birds. Although they are roughly the same size, they seem larger and louder than our Common Nighthawks, probably because they spread their primary feathers during flight like some raptors. My friend says the locals call them Night Eagles.

http://macaulaylibrary.org/audio/70674/autoplay