and keep all pocket gophers out, divide it into two equal parts 
by a stock fence, allow controlled grazing on one-half and no graz— 
ing on the other, and then check closely the plant successions as 
the vegetation returns to its old native sod condition. ; 
Qther Rodents 
Beavers may well be controlled by trapping them alive in local- 
ities where they are destructive to crops, roads, or timber and trans- 
planting them in new areas where they will not be objectionable. 
Damage by snowshoe hares to conifer seedlings has been somewhat 
controlled by felling small aspens in areas not far distant from the 
tree plantings; the hares are fond of the aspen and are lured away 
from the seedlings~-not entirely, but to a considerable extent. 
Similar studies of other species of rodents might be cited, but 
time will not permit. It is planned to continue these studies with 
the view of determining to what extent rodent pests may be controlled 
by preventive methods based on ecological relationships. 
Studies for Suppressing Coyotes 
Investigations along this line are being made of the natural 
drift movements of coyotes to learn the reason for the continued 
abundance of coyotes in certain sections and to what extent their mi- 
Srations are influenced by the movements of game and domestic stock. 
This is done by tagging coyote peps about the time they are ready to 
shift for themselves and then releasing them at the home den. 
Within one year after the release of the coyote pups about 45 
percent of the tags had been recovered by Government and private hunters. 
Of the 40 pups tagged and released in May and June of 1935 and 1936, 17 
returns were received. These returns may be grouped according to four 
types of drift as follows: 
i es COVOues recovered at the same altitude and locality in which 
released. Six of eighteen released were caught within an average of 1- 1/2 
miles from point of release. There were both natural wild food and 
domestic stock in the vicinity of the point of release so the coyotes 
did not need to go far for food. 
2. (Coyotes recovered at the same altitude at which released but 
in a different locality. Six of eighteen released were caught within an 
average of 27 miles from the point of release. ‘The sections in which 
aGe 
