Drought Relief for Native Animals

I live on 30 acres in Ballandean and we are in the middle of the worst drought on record. I started out feeding a few birds but then the kangaroos and wallabies started to come in and eat the wild bird seed I put out. I am now feeding about 15 wallabies and hundreds of birds. I spend every spare dollar I get on animal feed but it's just not enough. There is no feed left out there for the native animals, just dry empty land and no relief in sight. I would like to raise enough money to buy some large round bales of good quality barley or lucerne and just leave them in the bush on our property so that all the animals can get a feed of something nourishing and bulky. These bales are now about $250 each because they have to bring them in from so far away as the drought spreads and tightens it's grip.  It's absolutely heartbreaking to see the kangaroos and wallabies looking for feed that isn't there. I put out about 10 containers of water every day for the birds and animals but the whole process of providing food and water is exhausting and so expensive . I really need your help as I can't see an end to this for quite a while . I would be forever grateful for your help.