I did have a little go earlier, spawned into one of my tents on the African map and a legendary Cape Buffalo appeared at 350m and then once shot despawned at about 410m which got me thinking.
The game bases animal quantities on your draw distance settings in the gpu graphics quality section. Whilst a 3080 can easily max this game at 4K it is still very much a demanding game nearing 100% gpu usage. If you lower the draw distance you may not get animals until 300m or even 200m.
Just googled it, it’s the scene complexity setting that determined at what distance animals spawn into view. I say ‘determined’ all the stuff is from 2018 so this may have been changed.