How a population of billions vanished in just a few decades
In short: Once so numerous they could darken the daytime sky for hours, the passenger pigeon went from billions to zero in less than a century. This wasn't a slow decline, but a rapid collapse that left even the most abundant bird in North America entirely extinct.
Historical accounts, such as those from Potawatomi leader Simon Pokagon, describe massive flocks moving like an unbroken front, creating sounds like distant thunder and dropping from the sky like meteors. In 1871, naturalist A.W. Schorger estimated that communal nesting sites in Wisconsin covered 850 square miles, supporting roughly 136 million breeding adults.
The species' collapse was driven by human hunting during the 19th century. The sheer scale of their numbers led to a fatal fallacy: the belief that no amount of exploitation could endanger such a massive population. As hunting intensified, wild flock sizes plummeted from hundreds of millions to just dozens by the mid-1890s. The last known individual, a female named Martha, died at the Cincinnati Zoo on September 1, 1914, at approximately 29 years of age.
Recent genomic research has provided new nuance to this extinction. By analyzing DNA from skin samples taken from the toes of museum specimens, researchers like Beth Shapiro and Gemma Murray have challenged previous theories. While some thought the species suffered from dramatic population fluctuations, new evidence suggests the population was actually large and stable for a long time before hunting began. The birds had even evolved high rates of adaptive evolution to support their dense, collaborative lifestyle—behaviors like communal feeding and rearing young. However, when human hunting decimated their numbers, these very social mechanisms may have ceased to function, accelerating their disappearance.
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Sources
- Summary by Intellect · source: What Caused the Mass Extinction of Billions of Passenger Pigeons?
- Also: Why Did The Passenger Pigeon Go Extinct? The Answer Might Lie In Their Toes : The Two-Way : NPR
- Also: Why the Passenger Pigeon Went Extinct | Audubon
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