Shavings - I have one coop that is 6 x 8, and it takes a full bag of shavings to put a 2-3" layer in it.
One thing they might really enjoy - hang a suet feeder from the ceiling & fill it with nutritious treats such as wedges of squash, or greens - hang it just at head level; they have to work at getting the yummies out, and it will swing back & forth - they love it! Make sure they have grit, though, if you do this.
I will also put empty boxes in a coop - it's amazing how much fun they have jumping in & on them! Move them around each day so they have something "new" each day!
One thing they might really enjoy - hang a suet feeder from the ceiling & fill it with nutritious treats such as wedges of squash, or greens - hang it just at head level; they have to work at getting the yummies out, and it will swing back & forth - they love it! Make sure they have grit, though, if you do this.
I will also put empty boxes in a coop - it's amazing how much fun they have jumping in & on them! Move them around each day so they have something "new" each day!