A National Aquarium guest observes one of 20 sleek, fast-moving blacktip reef 

A National Aquarium guest observes one of 20 sleek, fast-moving blacktip reef sharks that were introduced to the aquarium's new Blacktip Reef exhibit on Monday, July 29, 2013 in Baltimore. The blacktip reef sharks will make themselves at home among the 260,000-gallon coral reef ecosystem featuring more than 700 marine animals, 3,000 pieces of coral and a sea turtle that weighs more than 500 pounds. (Steve Ruark/AP Images for National Aquarium)
Associated Press
A National Aquarium guest observes one of 20 sleek, fast-moving blacktip reef sharks that were introduced to the aquarium's new Blacktip Reef exhibit on Monday, July 29, 2013 in Baltimore. The blacktip reef sharks will make themselves at home among the 260,000-gallon coral reef ecosystem featuring more than 700 marine animals, 3,000 pieces of coral and a sea turtle that weighs more than 500 pounds. (Steve Ruark/AP Images for National Aquarium)
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