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Apparently there's an evolutionary theory that the reason why Africa has so much wild big-ass megafauna while the big-ass megafauna on all the other continents went extinct is because they evolved right beside humans, and knew us well enough to not get hunted into extinction.
So while everything from giant koalas to giant sloths barely had the time to think "what the fuck is that" before getting pierced by a spear and getting their bone marrow gently fed to babies and the toothless elderly, Africa had elephants who had all the time in the world to learn to tell apart human languages and teach the next generations of their herd which human sounds mean that this tribe won't hurt you, but humans who make this kind of sounds are a danger. And hippos learned to conclude "I think I'll fuck up this two-legged weird shit on sight."