Originally Posted by EmperorofTortuga
well, as based on Charles Darwin's theory of evolution,(PLEASE DO NOT RAGE AT ME IF YOU ARE RELIGIOUS, THIS IS THE ONLY EXAMPLE I HAVE) two specimens are considered different species when they can no longer reproduce with one another. This is why a common ground finch in the Galapagos could not reproduce with other types of finches. Since humans and Yordles are treated as different species, they cannot reproduce.
I DO WANT THIS THOUGH. HEIMERDINGER+VI= KING/QUEEN OF PILTOVER.
That's an incorrect interpretation of the theory. After all, we have the Beefalo, a fertile hyrbrid of the domestic cattle and the american bison, which are two different species, and are definitely not two breeds of the same species. Some birds, insects, fish and reptiles are also capable of producing fertile hybrids between two closely related species (like a Scarlet Macaw and Blue and Gold Macaw etc.). The reason Galapagos finches don't cross breed isn't because they can't at all, but rather because they don't want to as there are behavioural and morphological differences that make the other types of finches undesirable as breeding partners.
However, a human-yordle hybrid through conventional breeding is impossible. It's kinda like trying to cross a human and a racoon. However, this is Runterrra, therefore MAGIC PREVAILS.