prehistoric dolphin, 史前海豚

A newly identified prehistoric dolphin called Echovenator sandersi is seen in an undated illustration released August 4, 2016. Echovenator sandersi thrived in shallow, warm seas about 27 million years ago. (Photo by A. Gennari/Reuters)
The Day in Photos – August 5, 2016
http://avax.news/fact/The_Day_in_Photos_August_5_2016.html