The Passenger Pigeon is famous for the enormity of its historical population in North America (estimated at 3 to 5 billion) and for its rapid extinction in the face of mass slaughter by humans. Yet it remains a mystery why the species wasn't able to survive in at least a few small, isolated populations.
A female and male Passenger pigeon (Ectopistes migratorius) mount from the collections of the Royal Ontario Museum
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