Armadillos swallow air to
become buoyant when they swim.
When
armadillos go swimming, they don't need a flotation device to keep them from
sinking—they are the flotation device. To stay afloat, the
creatures swallow air to make themselves buoyant, according to the Library of Congress. However, they also have another option,
which involves expelling air so they can sink and walk across the bottom of a
body of water. Stunningly, armadillos can hold their breath for six minutes or
more
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