Whales evolved biosonar to chase squid into the deep

Behind the sailor's lore of fearsome battles between sperm whale and giant squid lies a deep question of evolution: How did these leviathans develop the underwater sonar needed to chase and catch squid in the inky depths"

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<p><a href="http://www.physorg.com/news108221235.html">Whales evolved biosonar to chase squid into the deep</a></p> <p>Behind the sailor's lore of fearsome battles between sperm whale and giant squid lies a deep question of evolution: How did these leviathans develop the underwater sonar needed to chase and catch squid in the inky depths"</p>