Ben Goldfarb is an environmental journalist whose work has appeared in publications including National Geographic, the Atlantic, and the New York Times. He is the author of “Crossings: How Road Ecology Is Shaping the Future of Our Planet” and “Eager: The Surprising, Secret Life of Beavers and Why They Matter,” winner of the PEN/E.O. Wilson Literary Science Writing Award. He lives in Colorado with his wife, Elise, and his dog, Kit — which is, of course, what you call a baby beaver.