Most penguins swim at four to seven miles per hour, but the fastest penguin—the gentoo (Pygoscelis papua)—can reach 22 mph!
Penguins' tuxedos help them be camouflaged while swimming. From above, their black backs blend into the dark ocean water and, from below, their white bellies match the bright surface lit by sunlight. This helps them avoid predators.
More than half of all penguin species rank as either endangered or vulnerable to extinction. Climate change is one of the main threats to penguins' existence as it is eroding the Antarctic. Overfishing is another driver. Humans are collecting krill in ever-increasing numbers.
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