I just wanted to point out that their is a difference between orcs and goblins in the movies. Now I know that this might just be PJ's interpretation, but in FotR, Gandlf, during his conversation with Elrond after Frodo's rescue at the ford, says:
Quote:
...he's crossing orcs with goblin men, he's breeding an army...
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This is in reference to Saruman. It suggests that orcs and goblins are two different creatures, because if they were the same, I don't think crossing an orc with an orc would give you an Uruk-hai. However, this is just the movies, so PJ could have added this. I checked in the book, but couldn't find it. Correct me if I'm wrong.