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U.S. Postal Commemorative, Jefferson National Expansion Memorial
St. Louis, Missouri
Blue whales, found in all of the world’s oceans, including U.S. waters, are the biggest and loudest animals on Earth. They emit sounds at a volume greater than 180 decibels in water, but pitched too low for humans to detect without sensitive equipment.
Wonders of America: Land of Superlatives Stamp Series@2005 United States Postal Service. All rights reserved. Used with Permission.
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Image courtesy of Jim Roberts, GVCC