The National Geographic Magazine, Volume 24National Geographic Society, 1913 - Geography Indexes kept up to date with supplements. |
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Page 670
... insects , some parasitic and predatory kinds . These latter are among Nature's most effective agents for keeping destructive insects in check . To the extent , then , that birds destroy useful parasitic insects , they are harmful . But ...
... insects , some parasitic and predatory kinds . These latter are among Nature's most effective agents for keeping destructive insects in check . To the extent , then , that birds destroy useful parasitic insects , they are harmful . But ...
Page 676
... insects and insects ' eggs , as well as spiders and spiders ' eggs , that are missed by the summer birds . On its bill of fare we find no product of husbandry nor any useful insects . HOUSE WREN ( Troglodytes aƫdon ) . Length , 44 ...
... insects and insects ' eggs , as well as spiders and spiders ' eggs , that are missed by the summer birds . On its bill of fare we find no product of husbandry nor any useful insects . HOUSE WREN ( Troglodytes aƫdon ) . Length , 44 ...
Page 693
... insect . Out of 410 stomachs examined , 314 were found to contain insects ; 129 , small mammals ; and 70 , small birds . This little falcon renders good service in destroying noxious insects and rodents and should be encour- aged and ...
... insect . Out of 410 stomachs examined , 314 were found to contain insects ; 129 , small mammals ; and 70 , small birds . This little falcon renders good service in destroying noxious insects and rodents and should be encour- aged and ...
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