70 
IBISES 
The fulvous tree-duck is a more or less common summer resident 
of the tule marshes and irrigated regions of southern California, 
breeding abundantly in favorite localities and migrating south in 
winter. Its usual nesting place seems to be on the ground in 
marshes, but it also breeds in trees. (See Bull. Cooper Ornithological 
Club , vol. i. No. 1, p. 9; and Condor, vol. iii. No. 3, p. 67.) 
GENUS OLOR. 
General Characters. — Size very large ; neck longer than body; bill 
black, large, and high at base, with naked space reaching eyes. Plum¬ 
age entirely pure white in adults. Young : ashy, or tinged with brownish; 
bill and feet grayish or flesh color. 
KEY TO ADULTS. 
1. Distance from eye to back of nostril greater than rest of bill. 
columbianus, p. 70. 
1'. Distance from eye to back of nostril less than rest of bill. 
buccinator, p. 70. 
180. Olor columbianus ( Ord .). Whistling Swan. 
Bill black ; lores usually with a small yellow spot. Length: 4£ feet, 
extent about 7 feet, wing 21-22, bill 3.80-4.20. 
Distribution. — North America, breeding far northward and probably in 
British Columbia; migrating south over the United States ; wintering 
from British Columbia and Illinois southward. 
Nest. — On ground usually on island or bank near water; made of moss, 
grass, and leaves. Eggs : 5 to 7, dull whitish. 
181. Olor buccinator (Rich.). Trumpeter Swan. 
Adult male. — Bill and lores entirely black. Length: 5-5£ feet, extent 8 
to nearly 10 feet, wing 21.00-27.50, bill 4.30-4.70. 
Distribution. — Interior of North America, less common toward the 
coasts, breeding from Iowa and the Dakotas northward, but mainly far 
north; wintering from southern British Columbia to Gulf of Mexico and 
southern California. 
Nest. — On ground, made of grass, leaves, and feathers. Eggs: 5 to 7, 
dull whitish. 
Mr. Grinnell says that the trumpeter swan is a regular spring 
visitant to the fresh water ponds and lakes in the vicinity of Los 
Angeles. 
ORDER HERODIONES: HERONS, STORKS, 
IBISES, ETC. 
(Families Plataleid^e, Ibidid^, Ciconiuxe, and Ardehle. 1 ) 
FAMILY IBIDIDiE: IBISES. 
KEY TO GENERA. 
1. Head of adult mainly naked, crown with short feathers. Guara, p. 71. 
1'. Head feathered except on lores, crown lightly crested. Plegadis, p. 71. 
1 See Appendix, page 486. 
