They hunt in winter, when the temperatures can drop to -40C (-40F). A hunt begins with days of trekking on horseback through snow to a mountain or ridge giving an excellent view of prey for miles around.
The skill of hunting with eagles, Svidensky says, lies in harnessing an unpredictable force of nature. "You don't really control the eagle. You can try and make her hunt an animal - and then it's a matter of nature. What will the eagle do? Will she make it? How will you get her back afterwards?"