The- Falcon. 
205 
THE PEEEGBINE FALCON. (Falco peregrinus.) 
The Peregrine Falcon, which is the most common kind, 
is from fifteen to eighteen inches in length. The bill is 
blue at the base, and black at the point ; the head, back, 
scapulars, and coverts of the wing are barred with deep 
black and blue ; the throat, neck, and upper part of the 
breast are white, tinged with yellow ; the bottom of the 
breast, belly, and thighs are of a grayish white ; and the 
tail is black and blue. Wilson enumerates no less than 
ten varieties, dependent chiefly upon age, sex, and 
