Well these are very good I have written an extensive article in the RIM magazine and would be more than happy to give any specific advice.. Quick tips include baiting with tid bits if you dont have a big zoom at least 400mm or better with a 1.4 or X2 TC they will soon get close enough to fill the frame Lighting is another factor and flash can leave the image looking very flat esp if there is snow when spot metering may be needed.. Tripods are awkward with quick creatures and rarely work a monopod maybe worthwhile IM me if you want any more detailed advice

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt