Either da fluffy penguins or pandas!
Probably pandas though since they're not usually at the zoo.
I live in Alberta, which has a much colder and dryer climate than what the pandas need, so it costs a lot of money to maintain their artificial climate. Plus there's also the costs from transporting them from China to here safely, and because there's a limited number of pandas, we usually only get them temporarily.
Question: What's your favorite section of the zoo?