Watch how hippos get cleaned in the river at Nzima in Africa in this fascinating National Geographic video.
Dozens of freshwater sharks with underhung mouths come up to the hippo as he rests in the water and scrape along his skin like pool cleaners, getting a nice meal of dead skin, algae and parasites.
In the hippo spa a number of fish pitch in to perform their special services. Some smaller fish, for example, clean out at the cracks between the hippos toes.
But the sharks get another reward. The hippo opens his mouth, and the sharks do a good job of cleaning his tongue and teeth getting all kinds of yummy rich pickings in the process.
Have you ever been to a day spa that provided such full service?
Photo credit: giselle azevedo