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Why do diving petrels resemble Northern Hemisphere auks?
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Procellariiform
Black-browed albatross (Diomedea melanophris).
Diving petrels resemble Northern Hemisphere auks due to a classic example of convergent evolution.1
Although diving petrels belong to the order Procellariiformes and are closely related to groups like albatrosses and shearwaters, they have evolved similar physical traits and habits to the auks (family Alcidae) of the Northern Hemisphere. Both groups are characterized by their short-winged, heavy-bodied forms and their shared reliance on using their wings for propulsion while swimming underwater. This resemblance is not the result of a close evolutionary relationship, but rather the independent development of similar adaptations to fill comparable ecological niches in their respective environments.12