I don't know if anyone else has heard of this website but I'm sure some of you would have. Zoos Worldwide I don't know about other countries but it has every zoo in Australia listed that I can think of and it also has some that I didn't know of.
This is a good website, for checking out different zoos websites. It also makes it easy for those holidays, to find a zoo or two close to where your staying It is a little outdate thou.