Sept., 1921 NESTS OF MOURNING DOVES WITH THREE YOUNG 147 
ble reasons why three squabs in a nest are such unusual occurrences: First, 
Fig, 27. THREE YOUNG MOURNING DOVES FROM ONE 
NEST, 6, 1 AND 7 DAYS OLD, RESPECTIVELY. THESE 
WERE TAKEN OUT OF THE ACTUAL NEST FOR PHOTO- 
GRAPHING, 
Photographed by Joseph M. Thuringer. 
the ordinary dove nest is too frail to hold three birds to maturity, and second- 
ly, the third bird may hatch so late that it is soon eliminated. 
Norman, Oklahoma, July 15, 1921. 
NOTES ON THE ROCKY MOUNTAIN JAY IN THE YELLOWSTONE 
NATIONAL PARK 
By M. P. SKINNER, Park Naturalist 
LTHOUGH the Rocky Mountain Jay (Perisoreus canadensis capitalis) is 
a known everywhere as the ‘‘camp robber’’, it shares this term with the 
Clark Nuteracker with which the former is thus confused; but the Nut- 
eracker has markings of black and white on wings and tail not possessed by 
the jay, is a larger bird, and carries a much longer and stronger bill. After 
the differences are once recognized, it is not hard to distinguish these two 
camp birds. It is true also that the Nutcracker ranges through, and breeds in, 
a lower zone than the Jay. 
While I have frequently found Rocky Mountain Jays in the smaller mea- 
dows and openings, still it is apparent they like the forests best. Forests of 
lodgepole pine, limber pine, fir, spruce, cedar, and even aspen groves and 
willow thickets constitute their chosen haunts. Their nests are in the lodge- 
pole pine belt between the 7500 and 8000 foot levels. For some obscure reason 
these birds are rare about Mammoth, although common about Tower Falls at 
about the same altitude. Rummaging about the refuse of old camp sites, as 
well as about camps in actual use, they are distinctively a camp bird although 
I should think ‘‘camp scavenger’’ a rather more appropriate name than ‘‘eamp 
