techbsmith
Chicken Hoarder
If your ground isn't still frozen, go out and dig up a big clump of sod - weeds, grasses, roots, little twigs, bugs and all - and put it in there. This does a few things. It gives them early access to the same ground they'll be living on when they go out. It's a good early exposure to the microbes and pathogens out there and helps them build up their natural immunities. It gives them something to play on - they climb it, fly onto it, play King of the Mountain on it, and as it breaks down they dust bathe in it. They get small bits of grit that are just their size.
That is an awesome idea!!! I'm heading out to the yard with my shovel now....