Richard Cannings is a renowned naturalist, conservationist, and lecturer on birds and bird habitats. He works as a consulting biologist assessing endangered species and organizing bird population surveys, and he can be heard on the CBC Radio 1 program BC Almanac as its regular birding expert. He is the author of Birds of Interior BC and the Rockies, An Enchantment of Birds, and The Rockies: A Natural History, and is co-author of Birds of Southwestern British Columbia and British Columbia: A Natural History. He lives in Penticton, BC. Hal Opperman is the principal author of A Birder's Guide to Washington; co-author of Birds of Southwestern British Columbia, Birds of the Puget Sound Region, and Birds of the Willamette Valley Region; and past editor of the Washington Ornithological Society's journal, Washington Birds. He lives in Seattle, Washington. Tom Aversa is the co-author of Birds of Southwestern British Columbia, Birds of the Puget Sound Region, and /i>Birds of the Willamette Valley Region. He is a records compiler for the Washington Ornithological Society and a member of the Washington Birds Records Committee. He lives in Seattle, Washington.