Edmund Selous, The romance of the animal world (1905)
“ The secondary quill feathers of the male are immensely developed, and very beautifully and æsthetically ornamented with a row of circular spots, so finely shaded that they stand out in perspective, like a real ball, as though drawn by a clever artist. Under ordinary circumstances these lovely ornaments are hidden, but when the wings are expanded they make, together, a great circular shield, which is thickly studded with them; and this starry firmament the male, when he wishes to make an impression, offers suddenly and with empressement to the gaze of the female. ”
