Hi Harina garu, not all humans have only one hair colour. Predominantly, human hair can be of five different colors: black, brown, blond, white/gray, and rarely red. Hair color changes result not only from alterations of melanin production but also from changes in the hair structure itself, altering its optical properties. A variety of genetic, metabolic, nutritional, and acquired disorders result in hair color changes. Hair color is determined by the amount of a pigment called melanin in hair. An abundance of one type of melanin, called eumelanin, gives people black or brown hair. An abundance of another pigment, called pheomelanin, gives people red hair. Hair color comes from both parents through the chromosomes passed onto their child. The 46 chromosomes have genes made up of DNA with instructions of what traits a child will inherit. Many animals use the colours and patterns on their bodies to help them blend into the background and avoid the attention of predators. As soon as the animal moves, the camouflage is broken, and it is much easier for a predator to see and catch it.