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A Passenger Pigeon (Ectopistes migratorius) egg at the Field Museum of Natural History, Chicago. Conservation status: extinct. On 14 September 1914, the last Passenger Pigeon died in a cage in Cincinnati Zoo. It is the only species for which we know the exact date of extinction. When Europeans settled in North America in the late 1500s,the E. migratorius population was as high as six billion in its foresthabitat in eastern North America, up to 40% of the total bird population on the continent. A few decades of reckless overhunting and deforestation in the late 1800s brought the worlds largest ever bird population to zero. Flocks were so dense that the birds could simply be batted out of the air with clubs as they flew over ridges; one shotgun blast could bring down as many as 50 birds. The naturalist John James Audubon observed one flock for three days and estimated the birds were flying past at a rate of 300 million per hour. Professional hunters tracked the nomadic flocks and met the demand for meat and feathers by suffocating birds nesting in trees with sulfurous fires, knocking nests and squabs (young pigeons) from trees, baiting and intoxicating them with alcohol-soaked grain to make them easier to catch and by using live decoys with their eyes sewn shut. By 1880, overkill had made commercial hunting unprofitable. In April 1896, hunters found the last remnant flock of 250,000 and in one day killed all but 5000 birdsâ other accounts say all were killed. Captive breeding efforts failed. Martha, the last Passenger Pigeon, remains on display at the Smithsonian Institute, Washington, DC.