I'll be honest, I suspected that to be an act of trolling. But, turns out the birds really do sound that way! As you can see in the video here (which is also in Russian. Scroll to about 1:40 to hear the birds)
Mr DeathPwny was the one who gave me the link.
|Yeah yeah. It's the wrong bustard. but this one looks so much cooler!|
Photo by FriendFrog