It doesn't always need to be in wildlife although it's more exciting. You can get quite far in a zoo as well. Please let me show you what i mean:
http://1x.com/photo/200737/all:user:405640
http://1x.com/photo/200738/all:user:405640
It only takes time and a lot of patience. Plus it's a lot safer than in wildlife :)
Hello Michelle:
Just my own opinion, I do n't like a zoo, animals there are locked, never I like to take pictures. In this case, I have no wildlife animals, no tigers, but a lot of small birds. At my environment there is a bird sanctuary and there are gooses, morhens, herons, damsels, etc.
I live nearby a landscape protection area and there are buzzards, and sometimes comes a sheepherder with his sheeps, and so I have a good chance to take pictures with animals.
http://1x.com/photo/216640/all:user:335132
Info to this image: (taken at the bird sanctuary) I saw it and pressed the bottom, a chance of one second. But I love it.