Yes, Human is the intelligent animal, do not forget we are ANIMAL too, but I know most of us have forgotten already, and so far controlling the world, but it doesn't mean that we can cage or abuse the other species. We're not the king of the world, even so, we have no right to do that!
I'm not an animalist yet I have to ask "Why we have Zoo/Circus". We always say we love animals, but the fact is we're NOT. The meaning of our "LOVE" is "love to watch them, the animals, in the cage and can not get out, they are funny when their begging for food." This is MORBID. The evil of humanity.
Of course, we, human and animals, all have integral consumption, otherwise we cannot do anything but starving to death. Inevitably, we eat, we use, we develop. But, what we can do is to constantly look for substitutes. Before we did, we should treat them well. Ask yourself that what if I'm in the cage!
What can we do? We have only got one brain two hands. Well, Stop visiting the Zoo/Circus, any kind of them. Stop abuse the animals, because you're ANIMAL too. Stop the excuse so-called "For Human Services", because you've no idea what animal think. In addition, we cannot behaviour like rogue in the name of goodness.
I say so because I do so.