Hi Rayzor,
The ptarmigan do have large prints, but I do not think thay are as larg as Outlaw is describing and they also conform to the standard three-toed prints that Outlaw describes.
Outlaw,
I have spent a lot of time on the snow climbing and have never seen a print like this one. The eagle does have a large claw at the rear but it still conforms to the standard three-toed bird design given to us by our loving Creator. ;)
A mystery, but I have written to a 'twitcher' friend for further help.
HS