. Some common mammals of western Montana in relation to agriculture and spotted fever . Fig. 6.— Hole set, made with ordinary outside-spring steel trap. and fully as good. (Fig. 7.) He and another man worked one andthree-quarter days staking and setting the 1,000 traps the first time,but on another occasion Mr. Haines alone set 500 traps in a day and. Fig. 7.—Four-foot cedar trap stakes at burrows of Columbian ground squirrels. himself tended the whole 1,000 traps. He used nothing but hole of the unfortunate features of this method of setting traps isthat weasels or other squirrel ene
. Some common mammals of western Montana in relation to agriculture and spotted fever . Fig. 6.— Hole set, made with ordinary outside-spring steel trap. and fully as good. (Fig. 7.) He and another man worked one andthree-quarter days staking and setting the 1,000 traps the first time,but on another occasion Mr. Haines alone set 500 traps in a day and. Fig. 7.—Four-foot cedar trap stakes at burrows of Columbian ground squirrels. himself tended the whole 1,000 traps. He used nothing but hole of the unfortunate features of this method of setting traps isthat weasels or other squirrel enemies are sure to be °---Bull. 4S4—12 3 18 COMMON MAMMALS OK WKSTKHN MONTANA. *9y? \ ^-_s • Fi<;. 8.—Surface set, made with Jump steel trap. Surface sots are made by sinking traps (lush with the surface of(lie ground near squirrel burrows and sprinkling oats or other bail in a circle just outside ofthe jaws. (Figs. 8 and0). The advantages ofthis method of settingare that fewer traps arerequired to cover a givennumber of burrows andthat enemies of squirrelsusing the burrows arenot endangered. Thedisadvantages are thatthe surface sets requiremore time to make, thatthey occasionally catchmeadow larks, quail, orother valuable birds,andthat they are not alwayscllVctive whein green vegetation is abundant. Jump traps withtheir
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