to which I say
Meh studio shots are studio shots
I fail to see how you can even compare the two. No likeness at all anywhere to be found.
Two totally different types of photography.
A person isn't a real person when posed and shot in a studio, its an artificial environment and detracts from the person and their natural emotions and actions. If you want to capture that for real you've got to get out on the street, capture them whilst they are unaware, without fake posing and faked emotion -with that true display of human life.
A zoo is no less or no more a place to see animals and to photograph them than any other and whilst some might say its darn sight easier since you don't have to stalk through mud and slim for weeks on a an end its still a valid place to shoot and can still produce some great shots (and I mean beyond both those that show animals being sad with paws at the bars and big eyes; and the shots that try to emulate a wild capture).
It's not uncommon to see a human being go into a studio, for a photo session.
It's not uncommon to see models posing for photographers.
It is, however, uncommon to the tune that will you never see a tiger ( or any other wild animal) walk into a studio to have his photo taken, nor is he going to pose for you. He might try to eat you, but posing for you is out of the question.
If a person walks into a studio and poses for a shot in that environment, it is totally natural human behavior. This is what people do. On the other hand, the best people shots that I've seen were of people who didn't know they were being photographed.
By the same token , it's very easy to do that because there is no shortage of people. Or unsuspecting people. Not to mention, if they see you before you see them no big deal.
If a tiger sees you before you see him, in the wild, odds are the next time a photographer sees you, you will be in a pine box surrounded by flowers. Suffice to say your remains are even found.
If a deer, wood duck, egret, blue herring, Hawk, sees or senses you before you see them, good luck because they're gone before you know it. Just like that, at the blink of an eye.
There are exceptions to the zoo shots, as I've mentioned. I might even try it myself. But this was not one of them.