Earliest dolphin species older than first thought

New research by the Waseda University in Japan has shown that dolphins may have been around for a lot longer than previously imagined.

Researchers studying a skull fragment first found in 1970 now think that it belonged to a species of dolphin that existed up to 13 million years ago, making it 6 million years older than previously thought.

The skull of the dolphin species, called Eodelphis kabatensis, was originally collected from a small tributary of the Oshirarika River in Hakkaido, Japan.