F. Gary Stiles is Professor of Biology and Curator of Birds at the Museum of Zoology, University of Costa Rica. The late Alexander F. Skutch lived in Costa Rica for more than 50 years and dedicated his professional life to studying the breeding biology of Neotropical birds. His many books include Life of the Woodpecker and Life of the Tanager. Dana Gardner, who is with the Western Foundation of Vertebrate Zoology, has extensive field experience in Costa Rica, Panama, and Colombia. He has illustrated a number of books on birds and tropical nature.