Iain Campbell is a PhD candidate at the University of New South Wales as well as a professional nature guide and habitat ecologist whose books include (with Dale Forbes and Pete Morris) Habitats of Europe (Princeton) and multiple bird guides. Charley Hesse is a professional nature guide whose books include (with Iain Campbell, Ken Behrens, and Phil Chaon) Habitats of the World (Princeton). Phil Gregory is a professional nature guide whose books include (with Richard Allen) Birds of Paradise and Bowerbirds (Princeton).