- Birds, Mammals, and Reptiles of the Galápagos Islands: An Identification Guide
- Birds, Mammals, and Reptiles of the Galapagos Islands: An Identification Guide, 2nd Edition
- Hummingbirds: A Celebration of Nature's Jewels
- The World's Rarest Birds
- Europe's Dragonflies: A Field Guide to the Damselflies and Dragonflies