BLUE WHALE: The bones of a blue whale's chest are seen at the Zoological Museum of the University of Kiel in Germany. Blue whales are the largest animals known to have existed. They can stretch up to 108 feet in length.
PHOTO: Heribert Proepper/AP
BLUE WHALE: The bones of a blue whale's chest are seen at the Zoological Museum of the University of Kiel in Germany. Blue whales are the largest animals known to have existed. They can stretch up to 108 feet in length.
PHOTO: Heribert Proepper/AP
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