6 WyYoMING BIRDS. 
seen that those mentioned are the ones which would .be 
expected to show the influences of the factors indicated 
above. ‘Those most frequently mentioned as having in- 
creased in numbers include the Robin, Meadow Lark, Blue- 
bird, Mourning Dove, Crow, Brewer’s Blackbird and Cow- 
bird. 
Many birds which were reported as rare in W. C. Knight’s 
“Birds of Wyoming,” published in 1902, are now reported 
by collectors as being fairly common. It seems, therefore, 
that Wyoming is rapidly becoming a more hospitable place 
for birds in general. 
There is considerable evidence to show that the quail has 
only recently migrated into the state, and that its migration 
was from Nebraska up the valley of the Platte River. At 
present it has penetrated as far as the mouth of Horse Shoe 
Creek, on the Platte, and as far as Uva; om the Waramie 
River, which is tributary to the Platte. The quail seems to 
have appeared in Wyoming first about 1890, and one in- 
formant thinks that it dies off during the winters from lack 
of food, and is prevented from further migration into Wyo- 
ming only because of lack of seeds. 
A similar evidence of the effect of food supply on the 
presence of birds in the state is given by Stanley Jewitt, of 
the U. S. Biological Survey, who says: 
“I found some kinds (of birds) very common in the 
more cultivated sections of Idaho and Wyoming during the 
last three years that were almost, if not entirely, unknown 
a few years ago. Such birds as the Bobolink, Yellow- 
headed Blackbird, and Lark Bunting follow the farmer as 
soon as irrigation systems are completed.” 
One of the most interesting points ascertained is in re- 
gard to the English Sparrow. In reply to a query as to 
whether there are any isolated towns in Wyoming to which 
