Si SPERM /HALES ARE EASILY ' RECOGNIZED BY THEIR MASSIVE HEADS AND PROMINENT ROUNDED FOREHEADS. THEY HAVE THE LARGEST BRAIN OF ANy CREATURE KNOWN TO HAVE LIVED ON EARTH, WITH THE HEAD REPRESENTING UP TO ONE-THIRD OF THE JNIMAL'S LENGTH SPERM WHALES ARE VOCAL AND EMIT A SERIES OF "CLANGS* TH
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