It starts with soul searching. First, ask yourself whether you want to have both human and animal partners, only human, or only animal. If you only want animal partners, then ask yourself whether the human would be ok with that. Same is the case for when you want to have both human and animal partners: how realistic is it to expect the human to be second-best to the animal, or to expect that the human has to accept that there's always an animal partner in the picture. If you only want to have human partners but you still have animal fantasies, the same applies: can you expect the human partner to accept there's always that fantasy?
When you look for partners here on the site, there's a fair chance they would not object to you having animal fantasies, but even if you are able to find somebody here and you manage to get a chat going, is a shared sexual fantasy alone enough of a foundation to build a relationship on?
And when you look beyond this forum, asking whether she has animal fantasies isn't exactly pillow talk, not even a pick up line. Which means that you might end up in a situation that you have this wonderful partner, but you have no idea what she thinks about zoo. Leading a double life can be exhausting, or even soul destroying. Testing the water to see if she has such interests always remains a gamble and could easily backfire.
I don't know how to square this circle. Of course the easiest option would be to find somebody here on the forum, but bear in mind that many female forum members are reluctant to present themselves as females because doing so leads to gazillions of unsolicited direct messages (or worse). Then there are also female members who aren't actually looking for human partners, and then there are also male forum members pretending to be female.
Probably a way forward here on the forum is to park the "I-need-to-find-a-human-partner" attitude. Start having chat with people, discover their interests, build up trust, and take it from there. It's not a quick fix, but I fear it's the only approach that just might work.