At zoos, they don't show us animals, they show us caged souls. As a kid, enjoying the animals there is fairly considerable but not for the grown-ups.
Although those documentaries highlight what it's like to be in the wild, I guess there is nothing wilder than remaining unseen and unexplored. When we overcome that barrier and explore everything on earth, we have to think that we have reached the limit; now we have nothing to do but wait for our certain demise.