Indian peafowl
There are several colour mutations of Indian peafowl. These very rarely occur in the wild, but selective breeding has made them common in captivity. The black-shouldered or Japanned mutation was initially considered as a subspecies of the Indian peafowl ("P. c. nigripennis") (or even a separate species ("P. nigripennis"))and was a topic of some interest during Darwin's time. It is, however, only a case of genetic variation within the population. In this mutation, the adult male is melanistic with black wings. Young birds with the "nigripennis" mutation are creamy white with fulvous-tipped wings. The gene produces melanism in the male and in the peahen it produces a dilution of colour with creamy white and brown markings. Other forms include the pied and white mutations, all of which are the result of allelic variation at specific loci.