The scientists who study this call it Drunken Monkeys.
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Alcohol contains calories which is energy. It seems chimpanzees seek out fermented fruit and stock up on it whenever found. Luckily, their stomach fills up before they can overindulge. Humans, with a large supply of available alcohol in higher concentrations, can easily overindulge and even become dependent.
We've been making our own alcoholic drinks for only 9,000 years. It turns out our ancestors have been consuming it for millions.