So no matter how much room I give the birds and how much water I put on the grass my geese and ducks are devouring the grass leaving nothing but hard packed dirt behind. With this drought the grass just doesn't have a chance. So I'm thinking of putting them in the smaller run and bringing in a load of sand spreading it around and giving up on the whole grass idea till the rains return. I've tried rotating them around but they eat everything too fast. The Question: is it OK for them to be on sand all the time, and how deep does it need to be? Most of the run I would use is shaded so it should stay pretty cool no lava sand problems there. The run is probably 40' x 30' with a small pool in it. I'm worried about my birds getting bumble foot walking around on hard grass less ground all day but maybe sand is no better?