A couple of species receiving attention in US zoos are giant salamanders. The St. Louis Zoo just moved their off exhibit pair of Chinese giants into a public exhibit in the Living World. The San Antonio Zoo opened a much larger exhibit for the Japanese giants, maybe a year or so ago. Fort Worth is planning on including giants in their spectacular new reptile/amphibian complex (if you haven't checked out the info on their website it's quite impressive ), and when I was at the National Zoo last year they were trying to secure the importation of 4 Japanese giants ( ultimately hoping to renovate a portion of the Reptile Discovery Center building as a breeding facility).