David Beadle has illustrated a number of books and field guides, including "New World Warblers" and "Sparrows of the United States and Canada", and a series of Ecotravellers guides to various neotropical countries. He is coauthor, with J. D. Rising, of two books on North American sparrows. He is at work on the forthcoming "Field Guide to the Birds of Brazil". J. D. Rising teaches in the Department of Zoology at the University of Toronto. He is the author, with David Beadle, of "A Guide to the Identification and Natural History of the Sparrows of the United States and Canada" and "Sparrows of the United States and Canada".