National Museum of Natural History

A fossil sea turtle skull excavated from Angola’s coastal cliffs. A cast of this fossil will be featured in “Sea Monsters Unearthed,” opening November 9 at the Smithsonian's National Museum of Natural History. (Hillsman S. Jackson, Southern Methodist University)

Q&A: Sea Monsters in Our Ancient Oceans Were Strangely Familiar

Stunning fossils reveal that Angola's ancient ocean ecosystem was at once strange and familiar.

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