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Halisaurus was a relatively small Mosasaur, a marine group of animals closely related to snakes. At 4 metres, it would wait in ambush near the coast for Hesperornis. It existed in the late Cretaceous, 86-65 million years ago. All Mosasaurs had the ability to open their mouths extremely wide, like snakes, and they swallowed their prey whole.

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