By observation or by instinct, one fox in the lineage had to be the first one to smash face-first into the snow bank and grab up that first, very very surprised victim.

I know the rightmost frame is reproducing http://i.dailymail.co.uk/i/pix/2012.....03_634x376.jpg , but the other frame is from a flickr account that I've lost in the intervening months and intervening computer images...