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Martha (right), an extinct passenger pigeon, at the Smithsonian's Natural history Museum in Washington. The passenger pigeon was once the world's most plentiful bird. Sept. 1 is the centenary of the bird's extinction.
September 1, 2014 Passenger pigeons were once the world's most abundant bird, but they were also the cheapest protein available. The last passenger pigeon, Martha, died exactly a century ago at the Cincinnati Zoo.
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