In his 1665 book Micrographia , Robert Hooke describes the `` fantastical '' ( structural , not pigment ) colors of the Peacock 's feathers : According to Charles Darwin 's 1859 theory of natural selection , features such as coloration evolved by providing individual animals with a reproductive advantage .
According to Charles Darwin 's 1859 theory of natural selection , features such as colouration evolved by providing individual animals with a reproductive advantage .