Quote:
they are an invention of Peter Jackson & Co
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Not entirely,
Son of Númenor. As
Elrond of Rivendell said in the thread to which
Thorongil linked, Tolkien does refer to great beasts pulling Grond:
Quote:
Grond they named it, in memory of the Hammer of the Underworld of old. Great beasts drew it, orcs surrounded it, and behind walked mountain-trolls to wield it.
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I don't think that Tolkien ever describes the beasts, so their appearance is pretty much a matter of interpretation. Personally, I think the designers did pretty well. They appear to be based on a prehistoric mammal called an
Arsinoitherium which, despite its appearance is not related to the rhinoceros, but belongs to an extinct group.
Edit: Ah, found some
pictures of the beasties