This week, we have an episode from the NHPR podcast “Outside/In” about passenger pigeons. The passenger pigeon is one of the world’s most symbolic extinction stories. It’s a cautionary tale of how in just a few short generations, one of the wonders of the world could be completely eradicated. But when that narrative was questioned in a popular book, 1491 by Charles Mann, what does the response tell us about the conservation movement as a whole?