Pombo Poulter ou papo-de-vento (Darwin, 1868, vol. 1, p. 137, Fig. 18).

Pombo Fantail ou rabo de leque (Darwin, 1868, vol. 1, p. 147, Fig. 21).

Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.

Popular Science Monthly/Volume 18/February 1881/Darwin on the Movements of Plants - Wikisource, the free online library

Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.

Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.

Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.

Um espécime morto de Columba lívia, o pombo-de-rocha (Darwin, 1868

Pombo Fantail ou rabo de leque (Darwin, 1868, vol. 1, p. 147, Fig. 21).

Pouter pigeons hi-res stock photography and images - Alamy

Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.