Animals can and do get drunk. There's plenty of research where the actual blood alcohol levels are measured and behavior observed to see the effects of alcohol on various species. The smaller the animal (and specifically, the liver), the more likely they are to get impaired when eating fermented fruit.

Can animals get drunk or high?

They do. A lot. Butterflies, for instance, enjoy a good brew, says Katy Prudic, an entomologist at the University of Arizona: “I've gotten butterflies out of beer cans before."

What animals Cannot get drunk?

Seven species of animals, including the treeshrew and the slow loris, feed on fermented nectar from the flower buds of the bertam palm plant. But though the treeshrew quaffs this brew all day long, it doesn't get drunk, scientists found in a 2008 PNAS study.