BIRDS OF NEW YORK STATE 



147 



(1) Nocturnal 



Screech owl Nu OwS4 



(2) Diurnal bird 



Sparrow hawk Nu HT4 



This is a bird of about the same size as the screech owl. 

 Compare as to eyes. 



(3) Woodland 



Canada warbler Nu WC 



(4) Open country 



Yellow warbler Nu WY 



Coloration 



The subject of the coloration of birds introduces one to many 

 of the most difficult problems in bird study. There are several 

 factors which control the coloration of birds. Birds of the same 

 species vary in color with sex, with age and with season. 



1 Color and sex 



With some species the sexes are both alike, either both bright 

 or both dull ; with other species, the male is bright and the female 

 dull. There are a few species, particularly the phalaropes, where 

 the female is brighter than the male. This might be considered 

 the case with the kingfisher, for the female has a rich rufous 

 band across her breast that the male lacks, while in other points 

 of plumage they are alike. 



a Male and female alike — dull 



Song sparrows, a pair Nu SpRl 



Chipping sparrows, a pair Nu SpC 



h Male bright, female dull 



Indigo bunting, male Nu Bui 



Indigo bunting, female Nu BuI2 



Rose-breasted grosbeak, male Nu GtR 



Rose-breasted grosbeak, female Nu GtR3 



c Male and female both bright or strikingly marked 

 Red-headed woodpecker, may be either male 



or female Nu WpS 



Chickadee, may be either male or female Nu Ci9 



d Male and female, both bright, female brighter than male 

 Kingfisher, female Nu KiB6 



