![](http://static.ddmcdn.com/gif/recipes/how-elephant-seals-know-whos-boss-200x200.jpg)
Male elephant seals recognize the unique calls of their
rivals, helping them know when to fight or flee, new research suggests.
![](http://static.ddmcdn.com/gif/humpback_whale_250x250.jpg)
Five distinct humpback whale populations have been identified
across the North Pacific Ocean in the most comprehensive genetic study
of the mammals in this region yet
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