Penguins are divers rather than fliers, but they still understand that air offers less resistance than water. When travelling at the surface, as opposed to chasing food, some species (including the Snares crested, shown here) commonly ‘fly’ out of the water at each thrust of their flippers, getting further than if they stayed in the water. This mode of travel is known as porpoising.
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Photograph by Lloyd Spencer Davis
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