No, I'll I have to disagree with you there.
The Amur leopard is a big animal, feline, cold weather, Asia, endangered. The same as the Amur tiger, so you're right there.
The Przewalski's horse is a big animal, equid, cold weather Asia, endangered. Unique.
The gibbon is a medium animal, ape, tropical, Asia (islands), endangered. Somewhat unique in that it represents a new taxonomical family, but a similar niche to the orangutans.
The oryx is a big animal, bovid, arid, Africa (North Africa), endangered. Unique again.
The red deer and fallow deer are the exact same niche for the game, that being large animal, deer, temperate, Europe, walkthrough, common/lease concern. That's what I mean when I say occupying the same niche. And I personally don't want two animals for that niche, it feels bloated for me. I don't even want the white-tailed deer, an animal that ranges throughout the entire Americas and would make arguably more sense.