THE ROCK PTARMIGAN. 205 
gan, is found in the Rocky Mountains, in Greenland, 
Labrador, Norway, and Sweden. The plumage of 
this bird is very beautiful, and we have had occasion 
in another chapter to notice the singular change 
which it undergoes from one season to another. Dur- 
Rock Ptarmigan. 
ing Winter that of the male is of a snowy whiteness, 
with the exception of a broad band of black extend- 
ing from the base of the bill to a short distance be- 
hind the eye, and the feathers of the tail, which are 
black. As Summer advances the white changes into 
a mixture of black, reddish-yellow, and white, beau- 
tifully varied, and marked with bars, spots, and bands 
of different shades. The female differs but little 
from the male, in Summer, the markings being per- 
haps a little less distinct. 
18 
