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"From Billions to None: The Passenger Pigeon’s Flight to Extinction" tells the incredible forgotten story of the passenger pigeon, its unlikely extinction, and its striking relevance to conservation challenges today.

Almost 100 years ago on September 1, 1914, Martha, the last known passenger pigeon in existence (named after Martha Washington) died in the Cincinnati Zoo. What happened to the passenger pigeon? You could say we happened.

Follow naturalist and author Joel Greenberg on a journey to discover how and why this bird went extinct, and how today the story is more relevant than ever.

These birds could literally fill the entire sky when they flew over. - sometimes for days at a time. It went dark and the temperature dropped. The sound of the flocks could get so loud that you might see a rifle shoot, but you wouldn’t hear the gunshot. Passenger pigeons were a force of nature like nothing that exists today. And they flew over most of the United States and into Canada.