Fifteen exquisite, scrupulously accurate watercolors of birds in their habitats are captioned by a deceptively simple text that offers one fact per illustration: ``Birds travel in different ways'' (Canada Geese). ``Most birds fly'' (Ruby- throated Hummingbird), ``but some swim'' (Wood Ducks), ``and others run'' (Greater Roadrunner). An Afterword briefly expands on the text, including specifics about relative sizes and birds' contributions to the environment. An excellent concept book that takes its young audience seriously while skillfully providing the basics of an important subject. (Nonfiction/Picture book. 3+)