https://www.journals.uchicago.edu/doi/abs/10.1086/499983

The suggestion that the African elephant (Loxodonta africana) becomes intoxicated from eating the fruit of the marula tree (Sclerocarya birrea) is an attractive, established, and persistent tale

https://royalsocietypublishing.org/rsbl/article/16/4/2020007...

Possibly the most iconic is the story of African elephants (Loxodonta africana) and marula fruit. According to this widespread lore, elephants across Africa preferentially feed on the fallen, fermenting fruit of the marula tree (Sclerocarya birrea), becoming intoxicated