I've seen a few people mention this as a substrate and I've been considering it. Presently, my quails (37 coturnix, 6 buttons) are all indoors and require an absurd amount of cleaning out, resulting in at least 6 black bags of woodshavings a week to be disposed of (they have to be cleaned out twice a week). That's too much for my wheelie bin, and the council only allows one black bag per week at the tip. And they check! Too much for me to compost too, so although I'm going to get an incinerator bin, I'm looking at alternatives. Even with the incinerator, I'd like to lower the cost as well. I like the idea of just scooping the poop from the sand and topping up as needed, but does it work that well? Is there not an issue of poop getting stuck to feet with a non-absorbent substrate and a lot of birds?