This member has provided no bio about themself...
When I jump I am pulled to the ground by gravity; when I fire a gun, there is recoil. The physics used in this game are believable because they imitate the physics in the real world. The anatomy of the specimens is also believable. There is space in the specimens for the necessary organs required for survival and the specimens move like you would expect an animal of similar structure. Once again the game is imitating what we observe in the real world. Animals chase animals for food. I don't see that being much different than specimens(animals) chasing humans(animals) for food.
Also, my first comment was a simple suggestion directed to the map creators. I don't know why you all are so eager to start an argument.
Not realism, just believability.
I see snow; I see lightning; I hear thunder. It's extremely unlikely that there would be thunder and lightning when it's also snowing.
Informational Link: En.wikipedia.org