John Kricher is professor emeritus of biology at Wheaton College in Massachusetts and an internationally recognized ecologist, ornithologist, and author. His books include The New Neotropical Companion, Tropical Ecology, and The Balance of Nature (all Princeton). Kevin Loughlin is a nature photographer and tour guide who has led more than forty trips to Galápagos. His photos and writing have appeared in many magazines, including Living Bird and Birding.