One of the most hilarious things to me personally is the combo of Creationist Jirt Tolkien and Actual Professor Jrrt especially re: evolution in Middle Earth.
Here are the canonical facts.
Elves did not evolve, they just woke up one day when God willed them into existence.
Dwarves (and ents and eagles) are like, the Archangel Gabriel’s school project. Definitely tinkered with a bit, but also very intentionally made.
Humans probably happened the same way as elves but since they’re not immortal and don’t still have primary sources from the dawn of time, there is no evidence of this. God definitely made them, but an argument can be made for engineered evolution as part of The Grand Design.
Orcs and trolls are a result of selective breeding, not natural selection.
So, in short, elves are an early release beta prototype with no patches, dwarves are a R&D experiment, orcs are a horrifying garage project, and humans are an actual slow release product with regular updates.
This means hobbits are the only species/sub-species to presumably evolve without divine intervention.
Tolkien canon has it that they are a “branch” of men. They did not show up in Eru’s blueprint. Hobbits are the result of nature just going wild.
Hobbits are the zenith of evolution. Peak adaption. They didn’t need the ultimate creator’s help, the cruel laws of the wild placed hobbits on top.