Instead, scientists examine growth bands in vertebrae, though these bands may not form annually ... sea lions, dolphins, and porpoises into their diet. This shift coincides with physical changes in ...

A total of 13 gigantic vertebrae – one of which weighed nearly 200 kilograms ... Today's cetaceans include dolphins, whales and porpoises, but their early ancestors lived on land, some resembling ...

The Yangtze finless porpoise is a remarkable yet critically endangered marine mammal inhabiting China’s longest river, the Yangtze. Known for its strikingly intelligent nature and perpetual smile, ...