GRAPHIC WARNING: A 12-year-old western lowland gorilla named Mizani has recovered after becoming the first known gorilla to undergo a mastoidectomy, a surgery t

GRAPHIC WARNING: A 12-year-old western lowland gorilla named Mizani has recovered after becoming the first known gorilla to undergo a mastoidectomy, a surgery that involved draining an infection and removing diseased bone behind the ear after it spread into parts of his skull [▻](https://video.twi…