The Yangtze River dolphin (Lipotes vexillifer), or baiji, are a type of freshwater dolphin thought to be the first dolphin species driven to extincti... more 
The Yangtze River dolphin (Lipotes vexillifer), or baiji, are a type of freshwater dolphin thought to be the first dolphin species driven to extincti less 
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LiveScience.com | Photo By Ding Wang et al. | Biology Letters
Fri, Aug 2, 2013 4:55 PM EDT