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Life & Evolution

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narwhals

FREEZE AND FLEE  Narwhals, mammals known as “unicorns of the sea” for their single tusk, have another oddity: Their hearts slow to near-arrest during frantic flights into the deep.

dolphin jumping

LISTENING IN  A computer code picked out six new types of dolphin clicks from several months’ worth of underwater sound recordings.

Halszkaraptor escuilliei

DINO SWIMMER  This birdlike dinosaur, Halszkaraptor escuilliei, probably spent a lot of time in the water. It had flipperlike forelimbs, a long neck for snatching aquatic food, and its upright posture resembles that of short-tailed birds such as ducks.

Life & Evolution

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