For killer whales, silence is golden as they hunt in complete darkness.
via Discovery News http://news.discovery.com/animals/whales-dolphins/killer-whales-go-dark-to-stalk-prey-131204.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/animals/whales-dolphins/killer-whales-go-dark-to-stalk-prey-131204.htm#mkcpgn=rssnws1
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