抄録
During March and August, 1954, the author investigated the nesting success of 103 nests of 29 species (13 Families) of birds at the wooded and cultivated lands, 850-1000m. of altitude, around Katsuyama-mura, Minamitsuru-gun, Yamanashi, within two kilometers radius The results are as follows:Percentage of human factors (chiefly boys) for total of damage was as high as 68%.
