Referencias:

Berta, A. et al. 2014. Review of the Cetacean Nose: Form, Function, and Evolution: THE CETACEAN NOSE. The Anatomical Record, 297(11), 2205-2215. DOI: 10.1002/ar.23034

Graham, Z. A. et al. 2020. The longer the better: evidence that narwhal tusks are sexually selected. Biology Letters, 16(3), 20190950. DOI: 10.1098/rsbl.2019.0950

Greene, H. W. et al. 2000. Limbless Tetrapods and Snakes with Legs. Science, 287(5460), 1939-1941. DOI: 10.1126/science.287.5460.1939

Izzo, J. 2020. The world of Avatar: a visual exploration. Dorling Kindersley Limited.

Muster, A. J. et al. 2001. The left-sided aortic arch in humans, viewed as the end-result of natural selection during vertebrate evolution. Cardiology in the Young, 11(1), 111-122. DOI: 10.1017/S104795110001252X

Stephenson, A. et al. 2017. The vertebrate heart: an evolutionary perspective. Journal of Anatomy, 231(6), 787-797. DOI: 10.1111/joa.12687