26.5 x 20 cm. (10.4 x 7.9 in.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...

These little birds are easily identifiable from their blue and green backs, bold white faces and yellow bellies. They’re not picky about habitats – they’re as at home in woodland as they are in town ...

After ruling out diet, scientists discover the secret behind blue feathers lies inside how the feathers are made. Gavriel Jecan / Corbis For decades, scientists have known how birds with yellow or ...