28 NORWEGIAN JER-FALCON. 



in both. The feet are, when young, of a dirty olive 

 green, approaching to yellow distinctly on the plates 

 covering the toes. The cere and eyelids are generally 

 rather brighter than the feet. 



The arrangement of colours of the adult Gyr-Falcon 

 is very agreeable, and resembles that of the full-grown 

 Peregrine, with the exception of the nape, which in 

 the former is ornamented with some white spots; head 

 and region of the ears slate-coloured. The moustache 

 is less marked, and not so dark; the spots of the in- 

 ferior parts are more decidedly transverse; but the feet 

 are of a greenish colour, and the tints in general offer 

 in their shades more or less sensible modifications. In 

 other respects the Gyr-Falcon is quite different from 

 the Peregrine ; the tail is longer, toes shorter, and 

 there are other characters proper to the division to 

 which it belongs, which must prevent the two birds 

 ever being mistaken for each other. 



The Gyr-Falcon in its perfect plumage, has the feet 

 of a bright olive green, dirty, rather pale, and 

 approaching to yellow very visibly upon the plates of 

 the toes; the cere and eyelids greenish yellow; beak 

 bluish, colour of horn, passing into black towards the 

 tip, and yellow towards the base. Upper parts and 

 sides of head, posterior and lateral parts of neck bluish 

 grey, black, or slate-colour: this tint is rather deeper 

 towards the centre of each feather. On each side of the 

 nape is a kind of incomplete collar formed by some rows 

 of whitish feathers, each ornamented with a longitudinal 

 blackish spot. All the feathers of the upper surface of 

 the wings and secondaries are the colour of dark slate, 

 approaching to brown: but this tint is broken by the 

 black quill shafts, as well as by the borders and spots 

 of bluish grey with which these feathers are ornamented. 



