Give em something that makes em think a kill happened there,,I used to use a old deer hide ,but anything that looks like a deer hide will work(brown blanket) works best on the snow cause they are looking for easy pickings on top of the snow,,,you can put some bright red paint on a brown blanket ahead of time,,,then spruce up the area with cheap ketchup on the snow,,,,,this is really affective for long term sniping,,,,,lasts quit a few days,,,,if you want something that works quickly,,try the ketchup in the snow,,and bait them w/popped popcorn(the big black birds will love you until the report of the rifle) hope this helps.............X