Dolphins' unique whistles say, 'Hey! Come play!' - msnbc.com

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Dolphins' unique whistles say, 'Hey! Come play!' msnbc.com Creative Creatures: 10 Animals That Use Tools World's Cutest Baby Wild Animals Digifish: Swim with Dolphins on your Computer Screen © 2012 LiveScience.com. All rights reserved. Advertise| AdChoices Image : Dolphins. and more »