Technically we can tame any creature (if it have brain of course), but hippos and rhinos are just to aggressive and stupid to make it worth, elephants on the other side are quite smart and docile to humans. Some studies says that they even see as as cute (at least the tamed ones) :). Basically the smarter creature is the easier it is to tame because it understand quicker that if it behave in expected way it will get food, shelter and protection.
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