Kestrels are birds of prey commonly found in Europe, Asia, Africa, and the North America. They belong to the falcon family but have a unique ability to hover in the air. You can find a whole bunch of videos (See 1,2,3,4, for example) about these fascinating creatures if you search "Kestrel hunting."
(You can click the images below to see the videos)
Rearview : Video from wildaboutimages (link here)
Video from viralhog (link here)
Side view in slow motion: Video from wildaboutimages (link here)
While I admire how they stabilize their head, I am fascinated by their ability to remain still in the air. Note that the bird doesn't have any external support and doesn't flap its wings during this process. There is no horizontal displacement even though there is a reasonably strong wind flow (enough to support its weight).
Why doesn't the bird get thrown backward like, say, a paper plane would in the wind?
While it could be possible that the movement is so small for us to see, watching and rewatching the video makes me think otherwise. Did the birds finally manage to get rid of drag, or is this some very delicate balancing of forces?
It should also be noted that this behavior is not limited to Kestrels or even birds. See this video of a barn owl hunting, for instance (not as impressive, but worth mentioning.), or this video where a hang glider gracefully hovers in the wind.