May, 1912 
SOME NORTH-CENTRAL COLORADO BIRD NOTES 
97 
52. Corvus corax sinuatus. Raven. 
53. Corvus brachyrhynchos. Crow. Durand and I could never agree 
as to the identity of certain birds we saw at Walden, near the North Platte River, 
and at Lake John. He was quite positive they were Crows, but I am sure that 
some, at lea.st, were Ravens. P)Ut we did run across a flock of birds July 5, 
while driving from Hell Creek to Lake John, which may have been Crows; they 
were rather small for Ravens, and there were more together than one often sees 
of that bird. We were unable to secure any specimens of these or any of the 
others we saw. Mr. E. N. Butler of Walden, who has resided in the North Park 
many years, told me he could not recall ever ha\'ing seen Crows in that region. 
54. Nucifraga Columbiana. Clarke Nutcracker. Seen twice on Mt. 
Zirkel. 
55. Molothrus ater. Cowbird. Noted at Elbert, Bijou Creek, between 
Ault and Fort Collins, and west of the Forks P. O. Seen south of Walden, and 
was very common at that place. Was at the North Platte, and between there 
Fig. ,18. WESTERN NIGHTH.WVK ON FENCE R.\IL. Figs. .16, .17, 
AND ,38 SHOW CHARACTERISTIC NIGHTH.AWK POSES 
and Lake John. Later it was observed at Troublesome Creek and Fraser. 
56. Xanthocephalus xanthocephalus. Yellow-headed Blackbird. First 
noted a few miles east of Fort Collins, and then a little way west of there. There 
were .some at Walden. The patch of rushes in Lake John was alive with the 
birds, and we found many nests with from one to four eggs ; one set of the latter 
number was collected and proved to be well incubated. In one nest we found a 
just-hatched young bird, an egg of the ordinary size, and runt egg half the size 
of the other. At our second stay at Walden one was noted feeding about our 
horses, at camp, in company with Brewer Blackbirds. After leaving the Park 
no more were seen except once about ten miles south of Steamboat Springs. 
57. Agelaius phoeniceus fortis. Thick-billed Redwing. Observed at 
various places on the Divide and thence to River Bend, wherever there was a 
stream or waterhole. May 29, at a slough a mile or .so west of Agate. Rockwell 
found a nest with three eggs, and one with four. It was at Big Muddy and 
