52 Birds of Colorado 
also winter at Barr. It has been seen at Loveland from February 
2nd to March 6th; on the western slope it reaches Grand Junction 
from February 27th to March 6th,and returns between September 
28th and October 22nd, according to Sullivan (Rockwell). It has 
also been noted from, Fort Lyon (Cooke), El Paso co. (Aiken collection) 
and Boulder (Henderson), while Warren informs me he saw two in 
the fall of 1902, on Decker’s Lake, near Crested Butte, at about 9,000 
feet. This is the only mountain record I have met with. 
Hersey and Rockwell report that this Duck nests in some numbers 
at Barr, though it is far more common on migration. A clutch of 
seven eggs, believed to be this species, was taken by I. C. Hall at 
Greeley on June 14th, 1903, and were presented by the collector to 
the Colorado College Museum. 
Habits.—The Redhead is usually found in considerable 
flocks on open water, often associating with Canvas- 
backs and other species ; it is a diving duck and obtains 
most of its food—aquatic grasses, mollusca, small crustacea 
and insects—in this way, though sometimes it dibbles 
as well in the shallows. 
It is, as a rule, very good-eating, rivalling to the taste 
of some the Canvas-back, for which it is often substituted. 
Its nest is placed on the ground near the water, or some- 
times among reeds over water like a Coot’s. Hall 
describes the nest he took at Greeley as being placed 
in a clump of rushes over open water, eight inches 
deep, and as being made of dry flags and lined with 
down. The eggs, in this case seven, but often ten in 
number, are dull white with a greenish tinge and average 
2°40 x 1:70. 
Canvas-back. Marila vallisneria. 
A.O.U. Checklist no 147—Colorado Records—Aiken 72, p. 210; 
Morrison 89, p. 165; Cooke 97, pp. 18, 55, 195 ; 06, p. 43; Felger 02, 
p. 294 ; 05, p. 421; Henderson 03, p. 234 ; 09, p. 226 ; Rockwell 08, p. 158. 
Description.—Male—Resembling generally the Redhead but dis- 
tinguished by the colour of the head and neck which is darker and 
browner and by the blackish chin and crown ; the markings of the back 
are more silvery ; this colour prevails over the wavy, dusky lines which 
are much narrower and more broken up; finally the bill is longer 
