Voluntary Alcohol Consumption in Chimpanzees and Orangutans

A study published in the June 1968 issue of the Quarterly Journal of Studies on Alcohol involved giving chimpanzees and orangutans as much vodka (mixed with fruit juice) as they wanted to drink in order to find out if they'd become alcoholics.

Reportedly the chimpanzees were enthusiastic drinkers and became drunk repeatedly. But oddly, the orangutans, although they drank, never showed any signs of intoxication.

I'm curious to know more details about the study, but unfortunately the article itself is locked behind a paywall.

Central New Jersey Home News - Aug 22, 1968