From Billions to None - Passenger Pigeons

A documentary movie about species extinction and a bird of transcendent beauty - the Passenger Pigeon. On Sept. 1, 1914, the last known passenger pigeon in existence, Martha, died in the Cincinnati Zoo. For decades, billions of passenger pigeons filled the sky. The documentary, “From Billions to None: The Passenger Pigeon's Flight to Extinction,” follows naturalist and author Joel Greenberg on a journey to discover how and why this species went extinct, and how this story is more relevant than ever today.

http://www.billionstonone.com/