WHITE GYRFALCON. 
Falco islandus. 
Char. Prevailing color white, often immaculate, but usually with 
dark markings. Legs partially feathered. A sharp tooth near point of 
upper mandible ; the end of under mandible notched. Length 21 to 24 
inches. 
Nest. Usually on a cliff ; roughly made of sticks, — large dry twigs. 
Eggs. 3-4 ; buff or brownish, marked with reddish brown ; 2.25 
X 1.25. 
GRAY GYRFALCON. 
Falco rusticolus. 
Char. Prevailing color dull gray, with whitish and slaty-blue bands 
and spots; sometimes white prevails ; thighs usually barred. 
