I have been to the Oregon Zoo over the decades many times, in the early '80s I remember they were walking with the chimpanzees - some of which are still in the zoo today along with gibbons too. My mother helped bring the first elephant to that zoo. There have been massive good changes to the primate enclosures, the '80s variety of exhibits would make your skin crawl today.
These days I am increasingly troubled especially with the larger, intelligent creatures (elephants and whales in particular besides the great apes) being kept for our pleasure. All of them should be kept for their own sake, not our own. I know funding that is hard without visitors but I am not sure... Ugh. I know I am a carnivore, that we had cattle that we raised, named and ate, but I also believe that respect for animals is important and I am still thinking about what my relationship/our relationship should be to these animals. I would really like to know what happened with Kutai.