The male sperm whale is the largest living toothed predator on Earth. Its submarine-like shape is perfectly adapted for deep diving - it can swim down to at least 6,500 feet to feed.
http://science.nbcnews.com/_news/2013/03/21/17402352-exhibit-shows-how-whales-ancestors-left-land-behind?lite
http://science.nbcnews.com/_news/2013/03/21/17402352-exhibit-shows-how-whales-ancestors-left-land-behind?lite
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