About the Marine Mammal Calculations

July 3, 2014 4:23 PM

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The Associated Press calculated annual survival rates and life expectancy averages for four species of marine mammals at more than 170 parks and aquariums in the United States. The species — killer whales, bottlenose dolphins, California sea lions and beluga whales — are among the most popular marine mammals kept in captivity at U.S facilities.

The source of the data was the Marine Mammals Inventory Report (MMIR), which is maintained by the National Marine Fisheries Service. U.S. parks and aquariums that hold marine mammals are required by law to report any deaths, transfers or acquisitions to the federal agency. The MMIR also includes dat...

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