Animal, you astonish me with your knowledge, I took this 6 years ago and not even in your home zoo (which is Hagenbeck) ... the leopard you idendified can even hardly be seen because of the rails.
According to ISIS they currently have most of Amur and Chinese leopards, so with these being no fewer than three, I thought they were either one. Leopards are usually alone or not more than two in an enclosure. Also these are not big (eliminating Persian and African) and they are rather furry, suggesting they are not from the temperate zone such as India or Java.