
A cat’s tongue is covered in hundreds of sharp, scoop shaped spines made of keratin that spring into action during grooming and they also play a role in helping a cat keep cool.
CT scans of cat’s tongues show the structure of the spines known as papillae. The spines are about 2mm long and have a U-shaped cavity at their tip. The hardness of the papillae is similar to human fingernails, showing how tough these structures are. When a cat is grooming, only the spines at the end of the tongue contact the fur. These are larger and not as closely packed as the spines nearer the bottom of the tongue.