Tudge, Colin. The secret life of birds : who they are and what they do / Colin Tudge. - London : Penguin Books, 2009. - xiii, 479 p. : ill. ; 20 cm. + 1 folded chart. Originally published as: Consider the birds by Allen Lane, 2008. Includes bibliographical references and index. ISBN: 9780141034768 (pbk.) 0141034769 (pbk.) Subjects--Topical Terms: Birds.Birds--Behavior.Birds--Evolution. Dewey Class. No.: 598 / TUD 2009