Christopher W. Leahy holds the Gerard A. Bertrand Chair of Natural History and Field Ornithology (Emeritus) at the Massachusetts Audubon Society. His books include Birds of Mongolia and The Birdwatcher's Companion to North American Birdlife (both Princeton). Abby McBride is a sketch biologist. She travels globally to write and illustrate stories about ecological research for outlets such as National Geographic and the Cornell Lab of Ornithology.