I remember watching a gorilla chucking up at Howletts Zoo once. He'd vomit copiously into his hand (well, some of it anyway), then proceed to eat it, licking every last drop from the platform he sat on.
Fascinating or what?
Not as fascintating as watching three puppies in a pet shop window, when I was a little lad. One took a sh*t, and the other two then ate it ! Nice !