The way I see it is that since evolution as we know it doesn't play a part in Middle-earth, then it would be Men who would be the "unnatural" ones. If you look closely at their history, they did go through a bit of evolution, or at least culturally. In the beginning, when they first awoke, they were a rustic, uncultured folk. When they came into contact with the Elves, they "evolved" into a very cultured race, almost like the Elves.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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