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Passenger Pigeons: Native to N. America, flocks of birds at one time were so large it was said they could block out the sun. One flock in 1866 was described as being 1 mile wide, 300 miles long and took 14 hours to pass, with estimated numbers of birds in excess of 3.5 billion. The species went from being one of the most abundant birds in the world to extinction during the space of just 100 years. Martha, thought to be the world's last Passenger Pigeon, died on Sept. 1, 1914 at Cincinnati…

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Passenger Pigeon - The species went from being one of the most abundant birds in the world during the 19th century to extinction early in the 20th century. The world's last Passenger Pigeon, died on September 1, 1914.