A study by the University of Exeter has found alcohol consumption to be quite common in the natural world. The reasons and the results of doing so are many and varied, but all resonate with the human experience. Male fruit flies turn to alcohol when they are rejected as a mate. And cedar waxwings, having gorged themselves silly on the over-ripe berries of the Brazilian pepper tree, fly off “under the influence” and crash into fences and other structures.

To quote the Guardian article:

[But] many animals seem to have an impressive alcohol tolerance. Despite the “prodigious ethanol consumption” of pen-tailed treeshrews, the scientists found no evidence that the animals became intoxicated, but concede it was “unclear how an inebriated treeshrew would behave”.