At least, our great(^nth) grandparents did.
Ha. Take that Neanderthals.
And take that, gorillas that use sign language.
The similarities between animals and humans are constantly used as arguments for why we shouldn't eat them, or use them for our (devilish) purposes. Ever since Peter Singer published the nauseating Animal Liberation bromide
"If possessing a higher degree of intelligence does not entitle one human to use another for his own ends, how can it entitle humans to exploit nonhumans for the same purpose?"
peta-tics have crapped themselves trying to prove that animals are equally intelligent to humans, as though making the Singer argument a de facto point would make it a fact.
But in fact, if we casually consumed our closest homanid, the Neanderthal, the much stronger argument is that our own advancement depends on the consumption of the "competition".