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Story summary
- A mosasaur tooth found in Hell Creek, North Dakota, alongside a Tyrannosaurus rex tooth, suggests mosasaurs fed on dinosaurs.
- Researchers led by Dr. Melanie During, a paleontologist, say mosasaur ancestors evolved to thrive in rivers as the Western Interior Seaway shifted from saltwater to freshwater.
- The adaptation mirrors behaviors seen in modern river dolphins and saltwater crocodiles.
- The findings, published in BMC Zoology, challenge prior ideas about mosasaur habitats.
