According to the email I got, there is a certain tree in Africa that produces a fruit that contains alcohol. Being the desert and all this juicy fruit is extremely tasty to all the animals.
The problem with this being, of course, that they get intoxicated when they eat the fruit.
I don't know if this is for real, but I can't imagine what else would make elephants and monkeys act this way.
The narrative in the video is in French, but you don't need to hear it to understand. But the music adds to it I think.