With the winter season about to come to a close for me, I thought I'd post a few photos of some of the wildlife scene in the park.  The above image is a grey wolf that crossed the road near where I was parked.  I rolled down my window and shot through it, using the window to hold the lens steady.  This image was made with a Canon 5D mk 2 shot at 500mm.  The wolf crossed the road near the Slough Creek turn off.

Bald eagles can usually be found near winter kill or wolf kill carcasses.  These two bald eagles were in this dead tree at Mammoth waiting for a turn to feed on a wolf kill carcass.  Again, in order not to scare off the eagles, I shot through my car window, braced against the window, using a Canon 50D and shot at 500mm.

These bison were blocking the road in Lamar Valley.  Often when stuck behind cars due to animals on the road, I pull out my camera while waiting.  I shot with the window down using a Canon 5D mk 2 and zoom lens.   The near bison was on the far side of the road while the distant bison was out in the valley.

And finally, this coyote, was shot in Little America late one afternoon.  I used a Canon 50D  and 500mm lens to capture this image.  Again, the image was shot from the car.  The coyote was howling to its mate, which was further down the road.  I shoot from the car alot for several reasons.  First, if the animal is close to the road, it's safer for me and the animal if I stay in the car.  Second, animals in Yellowstone are more accustomed to seeing vehicles so they are less likely to flee and act natural if there is a car pulled over on the side of the road.  Countless times I've been photographing this way only to have another car pull up and the occupants climb out causing the animal to run off.