Do they bring out a yeti?

While having a conversation with a friend tonight, this completely unrelated question came to me:

What happens with zoos during the winter?

It might seem stupid but I'd never thought about it before and it was totally blowing my mind. According to this site, zoos are a rockin' place during these chilly months. They try to house enough animals that don't hibernate to keep people coming, make skating rinks, put on light shows, and do shows and animal performances in theatres. I don't see why I would go to a zoo to ice skate unless I would get to skate with some some penguins or polar bears.