Has anyone tried breeding animals that cost gems? I have 2 tigers and it says I require only 6 gems to breed them. I currently have 8 gems, but when ever I try to breed the tigers it just goes back to the empty nest screen.

I can get as far as the screen where you select the animal to breed, then I choose the tiger and it goes back to the nest screen. I've tried going through the breed menu and through the animal exhibit menu...neither works. Any thoughts? I want a baby tiger!