The vole is definitely dead. It is hard to imagine what it must be like for the vole to suddenly have two huge talons punch through the crusted snow. Death! Mother nature is cruel. (Great Gray Owls can actually hear voles running beneath the snow. They hunt by listening for the sound of voles)
I watched this Great Gray Owl hunt late this morning in the Bog. After it successfully consumed a late breakfast, I walked back to the car and changed lenses such that I might photograph the owl impact point on the snow. Although words do not do it justice, there was two inches of fresh snow, an inch of crust, and 3 to 4 inches of snow beneath the crust. The other photographs were taken of the same exact hunt.
Yes, there are other birds in Sax-Zim Bog. I can always find these wild turkeys on cold days. They hang out 300 yards south of the intersection of Arkola and Overton. The depression keeps them warm in the sun and out of the wind. In a few weeks the males will start to strut their stuff for the females shortly after dawn.