https://skullsite.com/sphenisciformes/
Chinstrap penguin and Magellanic penguin:
https://www.researchgate.net/figure/Skull-of-Pygoscelis-antarctica-and-Spheniscus-magellanicus-in-dorsal-view-The-temporal_fig9_227624538
Adélie penguin:
http://n2t.net/ark:/65665/35ec910f5-3a11-4d5a-899a-630f6c21d9c4
https://www.sciencephoto.com/media/677090/view/adelie-penguin-skeleton
Yellow-eyed penguin:
https://www.researchgate.net/figure/Macerated-skulls-from-chicks-1-and-4-compared-with-one-unaffected-chick-from-the-Otago_fig4_262537855
https://fossilpenguins.wordpress.com/2012/09/25/killer-bobble-headed-penguins/
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