98 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 those 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 im- 
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 tow- 
ards 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. 
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