Hey, Frontier, while I totally agree with the decision you uphold to inform the players about the problems of keeping animals in Zoos and the challenges to keep them happy, I don't agree with the Polar Bears space requirements.
At the end of the day, It's a game, a fantasy, it's supposed to be fun and I frankly fail to see the fun in having to design so big an enclosure to have polar bears in our parks. Let's not even talk about the fact that it is very much not working well with other mechanics (guest visibility, keeper gates, feeding trays, etc).
If you really wanted to ram home the fact that they are notoriously difficult to keep happy in a zoo you could have played with other mechanics (higher happiness threshold that forces us to design the perfect enclosure, for example) I don't think giving them a space requirement ten times larger than those from all the other animals gathered is the way to go, It's simply getting in the way of our creativity and fun.
I'm not usually one to complain, but in this instance I think it was simply not the right decision. As you've proven times and times again, you listen to your community, understand our griefs and react accordingly when possible. I'm sure you will see the problem and find a solution that will please everyone.
Edit : Damn, Frontier adressed the issue while I was writing this. Thanks, you did see the problem and did find a solution to mitigate it. As I said : you are listening and we should all be gratful !