Ok, so, I posted something similar to this in the adventure mode section ( sorry by the way, a bit new here ), and got pretty good responces why my initial ideaz wouldn't work. I do however, have a few more to share, that I've refined a bit for my current understanding of the game.
1. I feel like animal people should have a little more difference in their field of view and other senses. For instance, irl a fox can hear a soft footfall on damp ground from almost two football fields away. However, they also have rather bad vision during the day, and can't see much color, and can't tell red from green at all. This could be implemented by making it so they can hear sounds and conversations from farther away, but have reduced vision during the day, as well as have difficilty distinguishing things based on color, ie not being able to tell if an object is be red or green. Similarly, a bat that uses echolocation might be able to see or sense things around corners where they normally wouldn't.
2. In my previous post, I mentioned how flying squirrels couldn't glide. By this I meant they couldn't go across say a small stream or river without swimming. In addition, they couldn't avoid certain ground based traps. I feel like a system where an appropriate creature could go a certain distance avoiding certain obstacles that are in the way, provided there isn't something above them that they would bang their head on.
3. I feel like tail blades should be a thing.
4. I feel like creatures with venom should be able to have something they can use to siphon or inject it into for later use, such as selling it, or using it as weapon poison.
5. Similarly, I feel like creatures who have scales or feathers that are valuable could remove them at the stakes of them possibly needing to bandage or care for the wound, and use them in similar ways.
6. This is a bit more intense, but certain creatures, such as specific species of lizard, can regrow their tails. I'm not saying that it would be a good idea to go and loose it, however. I think that, if something happens to it, like it breaks or gets crushed, that cutting it off might be an option, as it would return over time.
7. Animal familiarity. I am NOT saying that a animal person should be able to just go up to their counter part like old friends. What I am saying is that animal people should have a certain affinity with nature based on the roles of their animal counter parts. Like for instace, wolves might be slighty more lenient with wolf men being near them, maybe giving them a block or so extra when deciding whether they're a threat or not. I also feel that animal people of the same race should get huge bonuses when taming their own animal kin, as they would know better than almost anyone what their species desires and dislikes, giving a huge advatage in the taming process.
8. Natural enemies. I feel that, even if they are civilised creatures, two animal people whose counterparts are natural enemies should have a bit of a harder time getting a long, if for no more reason then subconscious distaste, similar to humans for insects. They could get over this difference of course, but as an initial meeting, this would most likely come into play.