Harry Greene is a much-admired natural historian and herpetologist with a soft spot for black-tailed rattlesnakes. He's spent years in the field studying venomous serpents, when not in the classroom or lab (he's currently a prof at Cornell; before that he was at UC Berkeley, where he both taught and curated the Museum of Vertebrate Zoology). Harry's a very thoughtful guy and serious writer, as evidenced in his new memoir Tracks and Shadows: Field Biology as Art. We talked about his career, about field biology vs. theory and experiment, about the wonders of snakedom and some of his favorite rattlers (like “Superfemale 21”), and life and death in the natural and human worlds.