THE BIRD BOOK 
f 179-] Whooper Swan. Olor cygnus. 
This European variety frequently is found in 
Greenland and formerly, regularly bred there. 
It nests in secluded swampy places in northern 
Europe. 
180. Whistling Swan. Olor columbianus. 
Range. — North America, breeding in the Arc- 
tic Circle, and wintering south to the Gulf of 
Mexico. 
These birds, which are nearly five feet in 
length, are snow white with the exception of 
the black bill and feet. The Whistling Swan 
is distinguished from the next species by the 
presence of a small yellow spot on either side 
of the bill near its base. Their nests are made 
of a large mass of rubbish, weeds, grass, moss, 
feathers and occasionally a few sticks. It is 
generally placed in a somewhat marshy place 
in the neighborhood of some isolated pond. 
The eggs are of a greenish or brownish buff 
color, and number from three to six. Size 4.00 
x 2.75. Data. — Mackenzie River. Nest a mass 
of weeds, sods and grass, lined with feathers; 
on an island near the mouth of the river. Col- 
lector, I. O. Stringer. 
181. Trumpeter Swan. Olor buccinator. 
Range. — Interior of North America from the Gulf of Mexico northward, breed- 
ing from northern United States northward. 
This is a magnificent bird, about five and one-half feet in length. Its plum- 
age is exactly like that of the preceding except that the bill is entirely black, 
and the nostral is located nearer the eye. Their nesting habits and eggs are 
the same as those of the Whistling Swan. While a few pairs may breed within 
the United States by far the greater number are found in the extreme north, 
from Hudson Bay to Alaska. The eggs may average a trifle larger than those 
of the preceding species. 
Whistling Swan 
114 
