FIG. 159. Types of Passerine Birds, showing generalized and specialized 

 forms. A, Swallow, Hirudo rustica; B, Lyre-Bird, Menura superba; C, Lesser 

 Bird of Paradise, Paradisea minor; D, Baltimore Oriole, Icterus Baltimore; E, 

 House-sparrow, Passer domesticus. (AH redrawn; C, after Knowlton, the rest after 

 Evans.) 



