The skeleton measured 17 feet (5.2 meters) long. But given the length of its missing parts (including the head), the Steller's sea cow likely measured nearly 20 feet (6 m) when it was alive, or ...

An unusually complete — albeit headless — skeleton of a Steller's sea cow was recently found in northeast Russia. For instance, researchers aren't sure how many vertebrae (the bones that make ...

An unusually complete — albeit headless — skeleton of a Steller's sea cow was recently found in northeast Russia. For instance, researchers aren't sure how many vertebrae (the bones that make up the ...