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Modern mammals frequently get high or drunk by eating fermented fruits. The same likely also applied to extinct mammals, particularl taxa like multituberculates which had diets leaning towards omnivory and herbivory.

Here, an arboreal ptilodontoidean is deeply intoxicated by rotten ginkgo fruits.

Being incorporated into Multituberculate Earth, this generic species now has the binomial Nunduapis tricolor: https://multituberculateearth.wordpress.com/2022/03/30/ptilodontoidea-conquerors-and-conquered/