. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . d in numbers that they have become have been obliged to resort to extraordinary meas-ures to destroy them. In Montana such large sums werepaid out in six months of 1887 in bounties for the destruc-tion of ground squirrels or gophers and prairie dogs, thata special session of the Legislature was called to repeal thelaw, lest it should bankrupt the State. In New
. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . d in numbers that they have become have been obliged to resort to extraordinary meas-ures to destroy them. In Montana such large sums werepaid out in six months of 1887 in bounties for the destruc-tion of ground squirrels or gophers and prairie dogs, thata special session of the Legislature was called to repeal thelaw, lest it should bankrupt the State. In New England our common hares (miscalled rabbits)are kept in check in thickly settled regions by hunters; butthe field mice, which are not subject to this check, haveincreased so rapidly in many localities that during the hardwinters of 1908-04 and 1904-05 thousands of young fruittrees in the New England States were attacked by them andruined. These mice have become so numerous that in someplaces young trees cannot be grown unless protected fromthem. They also destroy a great quantity of grass and grain,some small fruit, and vegetables. Unfortunately, the foodhabits of these little animals have never been fully PLATE VIII. —A Useful Mouse-eating Owl. (From AVarreu,after VALUE OF BIBBS TO MAN. 79 Enouofh is known, however, to show that tlicy have somebeneficial habits, as well as some injurious ones ; but theyconstitute a very potential force for harm, on account of theirgreat fecundit}\ I do not know how many young our com-mon species can produce in a year, but two female Europeanfield mice kei)t in captivity gave birth to thirty-six youngwithin five months. The tally was ended by the escape ofone of the pair, else there probably would have been re-corded a still larger number. The interval between the birthof one litter of 3oung and that of the next was only fromtwenty-four to twenty-nine da3^s. This shows the dangerthat might easil}^ arise from the unchecke
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