Last winter season my area received an inordinate amount of small snow and ice storms.
My birds refused to step outside on the snow and ice. They remained voluntary "cooped up" for weeks on end, as the cold temperatures hampered the melting process.
This past growing season, I decided to try my luck with producing silage, with the thought of covering the snow with this edible treat.
I won't go into details as to how I made it, as all my research was derived from this site, but what a pleasant surprise.
The picture below shows the silage on top of 18" of snow in their run!
This silage was from an April cutting 10 months ago...
and yes, that is a friend's gorgeous front lawn turf grass pesticide free.
The birds seem to enjoy it.