Animal drunkenness is a well documented phenomena. Many species of monkeys and apes will "recreationally drink," given the opportunity. Interestingly enough, the rate of "alcoholism" among many simians is inline with that of humans.

(skip to 0:55) https://www.youtube.com/watch?v=AIDJ-sTuoO8

Native wood pigeons, Kereru, do this in New Zealand. Stumbling on a drunk one is always memorable.