6 Birds of Colorado 
Horned Grebe. Colymbus auritus. 
A.O.U, Checklist no 3—Colorado Records—Cooke 97, pp. 49, 155; 
Hersey & Rockwell 09, p. 101. 
Description—Adult—Crown, sides of the face and chin, together 
with ruff, glossy black; a yellowish stripe deepening to chestnut at 
the end, runs from the base of the bill through the eye and ends in 
a crest at the side of the nape; rest of the upper-surface, including 
the back of the neck, dusky black ; the secondaries white ; neck and 
sides rich rufous; rest of under-parts silky white; iris carmine with 
a white ring, bill dusky, tipped with yellow, feet dusky and yellow. 
Length 15-0; wing 5°5; culmen -90; tarsus 1-65. 
Adults in winter, and young birds, have very slight indications of 
the crests and ruff; the crown, back of the neck and back are dusky 
black ; the lower-parts white, tinged with grey on the neck and pale 
dusky on the sides. 
Distribution.—Throughout the northern hemisphere. In America, 
breeding chiefly north of the United States boundary, from Alaska 
to New Brunswick ; south in winter throughout the greater part of 
the States. 
This is another Grebe whose status as a Colorado bird is rather 
doubtful. Captain Thorne states that according to his journal he 
killed w specimen near Fort Lyon, on the Arkansas River, October 
8th, 1887, but he does not appear to have preserved it. Mr. E. L. 
Berthoud informed Cooke that he had seen two Horned Grebes which 
had been killed on some lakes north-east of Golden ; and Hersey (09) 
saw two near Barr May 5th, 1906. It will probably be found to be 
a rare autumn migrant, like the two previous species. 
American Eared Grebe. 
Colymbus nigricollis californicus. 
A.O.U. Checklist no 4—Colorado Records—Henshaw 74, p. 243; 
75, p. 489 ; Scott 79, p. 96; Allen & Brewster 83, p.198 ; Goss 84, p. 18; 
Morrison 89, p.146 ; W. G. Smith 89, p. 138 ; 90, p. 141; Osburn 90, 
p- 68; Cooke 97, pp. 19, 49, 191; Dille 03, p. 74; Warren 08, p. 20; 
09, p. 13; Rockwell 08, p. 156; 10, p. 188 ; Henderson 09, p. 224. 
Description.—Adult—Crown, which is crested, neck all round, back, 
chin and throat, black ; auricular tufts golden to tawny, well developed 
and conspicuous ; primaries brown ; secondaries mostly white ; below 
from the breast silky white, the sides tawny-rufous and a little mottled 
with black ; iris carmine, bill black, feet dark olivaceous to blackish. 
Length 12; wing 5:0; culmen 1:0; tarsus 1:70. 
