Well, this isn't the first time we had a Tiger soaking in a Tiger River.
The last one was San Diego zoo, I think - I don't really remember because it was many many years ago.
Lasted several months - if I recll correctly. The cat ate the pillows and had a hard time with it - he ate a Tiger River baseball cap that somebody left lying around, I don't remember how well it helped or didn't help.
I got the impression that they were tyring it out to see if the cat would bother with it at all before putting in an more open tank of hot water. The final tank, if I am remembering right, ended up being a simple tank with warm water flowing into and out of it all day.