What does a cat's beard do? It measures its size.

A cat's beard is equivalent to its ruler, and its length is almost the same as its body width. If the beard does not touch the periphery of the object or only touches it a little, the cat can ensure smooth passage when it moves.

What does a cat's beard do? The second is the navigation function.

A cat's beard is thicker than ordinary hair, with its roots deep into the skin and covered with nerve endings, so it has the function of tactile receptors. It can also be used to help detect the change of airflow and let cats avoid obstacles in the dark, just like navigation.

What does a cat's beard do? The third part: judge the mood.

When the beard around the mouth hangs loosely on both sides, it means that it should be relaxed. If cats are ready to fight or get scared, their beards will stick back to their faces so as not to hurt them. When preparing for hunting or staying alert, the beard will face forward to help detect the presence of prey. This is also useful for the host.

Help hunter. In addition to the beard on the face, in fact, cats also have beards under their wrists, which is quite helpful for hunting. When a cat grabs its prey with the palm of its hand, the beard on its wrist can help the cat detect whether the prey is still moving and help determine the position of the prey so as to give an accurate blow.

I hope my answer is helpful to you.