Casey McFarland is a Senior Tracker certified by CyberTracker Conservation and a Senior CyberTracker Evaluator. He works internationally to train and certify biologists, research teams, and the public and runs courses on track and sign identification throughout the world. His is coauthor of Bird Feathers (Stackpole, 2010) and Peterson Field Guide to North American Bird Nests (to be released in 2019). He lives in Cedar Crest, New Mexico.