Well, my 2 month old chicks have this habit. When I remove the botton tray(which hold the poop)(it has wire above it) and I put the chicks on the grass my chicks spread out their wings far and sit down. And when they sit, one kinda shakes it butt and then sits. When they sit, they kinda tilt with 1 of their legs sticking out. The wing covers this leg when tthey do this. They only do this on the grass Why??? Is it normal?