Birds and Trees of North America is Rex Brasher's seminal work, comprised of 874 watercolor paintings bound in an encyclopedic set. Between 1929 and 1932, he created 100 twelve-volume sets—1,200 individual books—and sent them to patrons across North America. Volume 6 contains 101 birds, including eagles, falcons, caracara, owls, parrots, cuckoos, trogon, kingfishers, and woodpeckers.