Monkeys Drink Beer?

Last year, I visited Sompov Mountain located in Battam Bong province, Cambodia, and came across this big monkey along my way up the to the top of mountain. The monkey was naughty and snatched whatever people carried around if they were not careful. I was told that the monkey frequently drank beer given by its owner. I was like.....Is that really possible? . But through the look, i was quite convinced that it was true.... You can see its's belly right there.