Foster's Complete Guide is not always completely accurate and sometimes contains his own interpretations. As I understand it (and I may be wrong) the Uruks were inordinately large orcs bred by Sauron, but the Uruk-Hai were a different breed created by Saruman, likely through careful breeding, maybe including the addition of a human element in the gene pool.
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Beleriand, Beleriand,
the borders of the Elven-land.
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