From the four-foot-tall emperor penguin to the aptly named foot-long little penguin, these unique flightless birds have invaded habitats from Antarctica to the equator, not to mention the hearts of the public.

A gentoo penguin exiting the water [Credit: Keith Barnes]A comparison of the full genomes of 18 recognized species of penguins provides clues to how they achieved this success — though not their adorability — over tens of…

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Source: archeo