Robert S. Ridgely

Bob Ridgely is a leading authority on South American birds. He is also senior author of the Helm Field Guide: Birds of Ecuador. Guy Tudor's artwork has been acclaimed as the best on South American birds for more than three decades.

Bob Ridgely is a leading authority on South American birds. He is also senior author of the Helm Field Guide: Birds of Ecuador. Guy Tudor's artwork has been acclaimed as the best on South American birds for more than three decades. See less