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.
Misidentified remains provide a missing link that helps resolve a gap of more than 5 million years in fur seal and sea lion evolutionary history.
A rodent closely related to guinea pigs used its powerful incisors to do more than just bite things.
The reptile is an extinct species called the philydrosaurus, and likely lived during the Early Cretaceous, about 145 to about 100 million years ago.
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