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Penguins Safely Lower Oxygen to "Blackout" Levels
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Higher concentrations of hemoglobin and the blood protein myoglobin allow emperor penguins to store about 2.5 times more oxygen per unit of body mass than humans
From National Geographic News...
Emperor penguins may have a supercharged form of a blood protein that allows them to dive underwater for more than 20 minutes on a single breath, a new study suggests. The research showed that penguins in Antarctica return from long fishing excursions under the sea ice with the lowest blood oxygen levels ever recorded in wild animals.
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