@geomorph I'v just seen this great list and wondering is there still Crowned or Bush Duikers in Lowry Park or in any other zoo in US ? They seem very common in Africa, but like the Bushbucks almost unheard in zoos. There is a picture in the Dr. Castello's Bovids of the World of Southern Bush Duiker in Tampa, made by famous ZooChater, but this is not a guarantee, of course.
I am not aware of these species in any US zoos.