u/Complete_Cod_8222

https://biomeconservation.org/project/mt-elgon-elephants/

"The slopes of Mount Elgon are pitted with a series of caves that contain salt deposits. These caves are visited by wild elephants who gouge the cave walls with their tusks to lick the exposed salt. These are the only elephants known to go deep into caves to 'mine salt'."

Edit: Here's a 9 minute video featuring these caving elephants. https://vimeo.com/35525821