We still do not know what we are dealing with when it comes to wild animals. Even our knowledge of nature does not mean we can fully recreate it. Animals have a weird sense of instinct that is far more advanced than we are, even though we would like to kid ourselves into thinking we are better than them. We are not. Animals are unpredictable because we haven't figured them out. And yet we kid ourselves into thinking somehow by recreating an enclosure or aquarium, this is enough. It is fake, and the animals know it. And they have other senses that tells them humans can't ever be trusted, and are as fickle as the wind.