When I read the Hobbit and LoTR I viewed goblins and orcs as two different species. Almost like cousins in a way. I pictured goblins as smaller, long lanky arms, a bit slimy and with larger eyes. They were found in Moria and other dark places. While I pictured orcs as larger, about the size of a human. They were broad shouldered, darker skinned, and were a lot fiercer than goblins. The Uruk-hai were even larger and more fearsome than reagular goblins and orcs.
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