from what i heard, saw and read, I believe the Uruk-Hai are a magickal crossing of Orcs, Goblins and Men or just Orcs and Goblins. Saruman cannot create life but he can spoil it, I would believe it's a magickal crossing of the two. As for them being born grown-up... what good does it do to have to RAISE a bunch of baby uruk-hai to be soldiers, when you need them RIGHT NOW. So, I assume that this process was also sped up by Saruman's magic
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