Hendrik the centre you are talking about is the Endemic Species Centre. It’s been discussed a lot in this thread:
[Distinctive towns
Fun area. Good biking and lots of beautiful scenery. I’m glad your going. Not many foreigners know about this part of Taiwan yet.
Almas John is your man to talk to about animals in Taiwan. He’s been training a troop of monkeys to perform all 12 stations of the cross for the upcoming visit of the Pope to Taiwan. Heard he’s also working with a Taiwan Beauty Snake to do the temptation scene from Paradise Lost.
If you want to see monkeys I suggest going to Kaoshiung City to Chaishan. You’re garanteed to see monkesy. Hell, you’re garnanteed to get robbed by them if you hang around too long. 
Oh, wait, there is also a monkey conservation area near the Endemic Species Centre. Just take the train a few stops west to Ershui.