Tiny structures in well-preserved remains point the way to an animal's pigment.
More than 30 specimens of a new species were discovered in what was long ago an estuary.
The 120-million-year-old creature beats the previous fossil find by about 25 million years.
The fossils are at least 5.8 million years old and could shed light on the evolutionary history of the freshwater mammals.
The never-before seen, and now extinct, species confirms that the creatures once lived in the Caribbean, where they are not found today.
The tracks are helping researchers understand what types of dinosaurs lived in what is now modern-day northern Germany.
The roughly 10-foot-long (3 meters) creature didn't have tusks as walruses do today but instead sported moderate-sized upper canines.
The find is a skull fragment with an unusually large structure in the forebrain called the olfactory bulb, suggesting the dinosaur had a sharp sense of smell.
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