Kinji the Cheetah loves other animals and has a special relationship with a particular meerkat (a small carnivore of the mongoose family). And this meerkat loves to groom Kinji.
Kinji will walk up to the meerkat, who reaches his paws through its cage and scratches Kinji on his face, who purrs in delight. Ironically, the two do not even realize that if they were in the wild, they would be enemies. (Cheetahs eat meerkats in the wild.)
A cheetah’s purr is quite incredible: as is this predator/prey relationship.