Checking “find the coolest thing anyone will see today” off the to-do list.
How was this done? Nobody seems to really know. Obviously, it was some sort of camera but Go Pro would seem to be a little large to get an eagle to participate. The author of the video isn’t saying — yet — how he did it, or how he retrieved the video after the eagle had taken its trip around the Mer de Glace glacier in the Haute-Savoie area of the Alps.
Of course, we don’t really know it’s a real eagle, either (although the brief shadow at :56 seems to confirm it is). It could turn out to be Jimmy Kimmel.