The no-slip grip

Cats, like humans, have sebaceous glands in their skin that secrete sebum, a fatty substance that gives hair its sheen and also provides a water-repellant covering to the skin. The one area totally lacking in sebum are the pads of the paws, which explains why a cat’s paw pads always feel dry. It also explains why the pads are such excellent grippers—they’re oil-free!
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