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Thaniel said:One problem. Dogs and wolves are classified as different species. However, they can create fertile offspring. Therefore elves, orcs, and humans can still be different species and still produce fertile offspring. There is precedent.
Dogs of wolves are not classified are different species (at least, not correctly). The definition of species is based on the ability to interbreed. If they can interbreed, they are the same species, by the definition of the word.
See http://dictionary.reference.com/search?q=species
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