Martha died alone, becoming the first named member of an exclusive and terrible club: The Endlings. This episode we're tracking the history of the passenger pigeon, a bird that once darkened American skies by the billions. The story of the passenger pigeon is the story of our understanding of extinction, and the lessons we once learned but appear to be struggling to remember. Visit our Patreon page here (https://www.patreon.com/theconstant). And our sponsor, www.industrialartifacts.net (https://www.industrialartifacts.net/) where you can entered coupon code "theconstant" for 15% off your first order. Learn more about your ad choices. Visit megaphone.fm/adchoices