FULVOUS TREE-DUCK 139 
bering two or three hundred are seen in the cold 
season. Their migrations are very irregular, and 
sometimes they are excessively abundant in a district 
one year and absent from it the next. When disturbed 
they utter a loud musical trumpeting cry, in three 
notes, the last with a falling inflexion; and their 
wings being much longer proportionately than in 
the black-necked species, they rise with greater ease 
and have a much freer and an almost soundless 
flight. 
Concerning their breeding-habits Mr. Gibson 
observes that the nest is usually placed on the 
ground at some distance from the water. It is 
about a foot and a half high, made of mud and 
rushes; the hollow, which is rather deep, is lined 
with dry grass. 
The eggs are eight or nine in number; smooth, 
white, and rounder than those of Cygnus nigricollis. 
FULVOUS TREE-DUCK 
Dendrocygna fulva 
Chestnut-red, top of head darker, with black line down the nape ; 
back black on the upper portion, banded with chestnut; wings and 
tail black; lesser wing-coverts dark chestnut; upper tail-coverts 
white ; flanks chestnut, banded with black and white; bill and feet 
black; length 18, wing 8.5 inches. 
Tuts Duck, the well-known Pato silvon (Whistling 
Duck) of the eastern Argentine country, is found 
abundantly along the Plata and the great streams 
