The boys borrowed one of an Indian girl, who was sitting in the shade of some willows prinking herself artistically with an original and intricate Pigmentary pattern.
"Captured by the Navajos"
Charles A. Curtis
It is a probable speculation that all Pigmentary colours were originally incidental; but now and for immense periods of time the visible tints of animals have been modified and arranged so as to assist in the struggle with other organisms or in courtship.
"Darwin and Modern Science"
A.C. Seward and Others
One example described was castrated in full winter plumage in December 1906. On July 11, when normally it would have been in eclipse, the nuptial plumage was unmodified except for a diffuse light-brown coloration on the abdomen, which is stated to be due not to any growth of new feathers but to Pigmentary modification in the old.
"Hormones and Heredity"
J. T. Cunningham