Ancient poetry unveils history of critically endangered finless porpoises, scientists say

Scientists studied more than 700 ancient Chinese poems that mention the Yangtze finless porpoise to determine its population history, according to a new study.

​ Scientists studied more than 700 ancient Chinese poems that mention the Yangtze finless porpoise to determine its population history, according to a new study. Read More Breaking News, Latest News and Videos | CNN