Is it normal to want to go to the zoo alone?

Yes, it`s absolutely normal.

I find talking to my family in their cages are not so stressfull as when my friends are around.:-)

Yes. I'm not sure if I would mind it but I fear that if I did that in the zoo I used to visit in the summers that I might accidentally kill myself. I'd HAVE to go with someone else or go to another zoo.

I wouldn't do it purely because i like to comment about everything and would end up being that crazy person who talks to strangers. But if you ate happy to go alone then do it. I see plenty of people alone with cameras. I just assume they are working (though not all would be abvioisly). Your normal, go for it.

you would get to examine the animals closer. nothing wrong with that. :) maybe you need to find someone who is as interested in the animals more so than the social interaction

I don't see anything wrong with going to the zoo alone. If that is what you would enjoy doing them I think you should do it.
There is really no telling what I would think if I saw someone at the zoo alone. It just depends on your character and how you carry yourself. I could think anything from extreme animal enthusiast, to psychotic loner. It just depends. Haha

Theres nothing wrong wanting some alone time just interested are you man or Women?

Zoo's? Do they really still have that shit?Probably only in foriegn countries they do. Not in the U.S.A.though.