Is there a mod that manages what animals spawn and how many of each kind? 

https://umod.org/plugins/custom-animal-spawns

Rust also has some commands natively to set the amounts I believe.

Thanks for the recommendation, not sure it's exactly what i'm looking for tho. Not so interested in creating custom spawn points, just editing what does and does not spawn and how many of them at the vanilla spawn points. Although it might do that too i'll let you know once it's working on my end.

@Oddyseous SpawnConfig >> https://oxidemod.org/plugins/spawnconfig.1346/