I recently found a pile of bear bones in a place I thought I never visited before, and I was initially astounded, before realizing it must've been a bear that I personally killed weaks ago. It would be impossible to find something like that in a completely new terrain.
It's currently possible to sometimes witness predators killing and eating prey, but they both must be spawned first before they can meet.
Why not pre-generate dead animal remains too? Logically they must be everywhere in the world, so it should be possible to stumble upon them once in a while (even if very rarely).
1. Eaten/rotten remains of an animal: If predators and prey animals get generated in a new area, then why not just pre-spawn a useless but interesting carcass alongside them?
2. Pile of bones/feathers: Shouldn't this be a normal occurence that some animals either get eaten, or just die naturally, and so their remains sometimes just lie scattered in random places?