Why Do Cats Always Lick Their Hairs?

After enjoying the sunshine, cats always lie on the ground and lick their hair. Then their hair becomes clean and smooth. Some people think cats lick their hair to give themselves a bath. But this is wrong. They are not having a bath, but are eating a -nutrient. Something hidden in their hair becomes Vitamin D after absorbing sunshine. So, cats are actually eating Vitamin D. Ifthey lack Vitamin D, cats develop osteomalacia and appear listless all day long.