Pliny the Elder wrote fiction about "Aethiopia" - which was shorthand for anyplace south of Egypt. There weren't people 12' tall.
Pygmies - average height around 4'6" among males
But that's not a species differentiation -- there's huge height variation between Nederlanden and Sicilians, but are they of different species? No.
Or between a yorkie and a Great dane, but they're the same species, Canis lupus familiaris
“Or between a yorkie and a Great dane, but they’re the same species, Canis lupus familiaris”
AND ! Other than size I think we can all allow some ‘breeds’ much smarter than others ??.....Altho all same species ?