That’s probably what got them swingin’.
Animals do love a tot. and do get hung over.
In “Animals are Beautiful People” a movie by Jamie Uys, a gifted South African film maker are scenes of the animals’ annual binge on fermented Marulla berries.
YouTube clip of drinking / hangover sequences here https://www.youtube.com/watch?v=8MxNLg3rCdw
Hysterically funny.