The Weddell seal is one of the deepest diving seals on earth and can hold its breath underwater for up to 90 minutes in their native habitat of Antarctica. Scientists have just begun to unravel what physiological characteristics in the seals' swimming muscles allow them to dive so deep and for so long. But now, new research from Baylor University biologists has found that there is a switching of fuel usage as this animal goes from a non-diving pup to a juvenile diver.
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