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  4. http://ocean.si.edu/through-time/ancient-seas/ammonite Ammonite
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Ammonite

Illustration of the extinct ammonite, related to the modern squid.

Like the modern nautilus, this relative of modern squid hunted from inside the safe haven of a protective shell. Ammonites went extinct around the same time as the dinosaurs—65 million years ago.  Find more about ocean predators in our interactive timeline Who's on Top?

Tags: Scientific illustrations Paleobiology

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