We visited the zoo using our Copenhagen cards and planned to stay for a couple of hours just to see some of the more unusual animals that we hadn't seen before. We prioritised the polar bears, pandas, bears and kangaroos but also saw various others and ended up staying longer than planned. I did feel a bit conflicted about seeing some of the animals in what I think were too-small enclosures (such as the polar bears) and overall, although the zoo felt a bit dated in parts, all the animals appeared well cared for and happy.
We had lunch at the pitta van which was very good, and there are lots of places to eat throughout the zoo. If we'd had more time I think we could have spent most of the day there.