@Otter Lord: haven't you visited the Woodland Park Zoo? The Japanese serows are in the Temperate Forest section of the zoo, along with reeves muntjacs, red pandas, white-naped cranes and a lot of waterfowl and other birds. The Family Farm and Bug World sections of the zoo are also found in that area.
I have when I was 13, and I regret not getting the best out of the experience back then. I hardly remember anything from it but some of the big exhibits. Sometimes I try to look at the zoo map to try and jog my memory but it doesn't really work because the Woodland Park Zoo map isn't very detailed.