It's not vanity. For cats, staying clean is a matter of life and death. And their tongue, specially equipped for the job, is just one of the things that makes cats such successful predators.
DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe. Explore big scientific mysteries by going incredibly small.
