The National Geographic Magazine, Volume 90National Geographic Society, 1946 - Geography |
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Page 72
Snow in Early October Finds a White - tailed Ptarmigan Changing to Winter Dress Brown and black summer plumage of this grouselike bird is a marvel of protective coloration . “ It is always surprising to find that a rounded granite rock ...
Snow in Early October Finds a White - tailed Ptarmigan Changing to Winter Dress Brown and black summer plumage of this grouselike bird is a marvel of protective coloration . “ It is always surprising to find that a rounded granite rock ...
Page 128
... from one cave to another during Another important requirement also usually a single winter . satisfied by caves and burrows is that the Bats ... and even in the caves throughApparently no mammal can survive freezing out the winter .
... from one cave to another during Another important requirement also usually a single winter . satisfied by caves and burrows is that the Bats ... and even in the caves throughApparently no mammal can survive freezing out the winter .
Page 132
ease . buildings to their winter quarters in caves . right at the building where they are caught . The returns substantiate the theory previously The distance from which transported bats advanced that even the cave bats may migrate have ...
ease . buildings to their winter quarters in caves . right at the building where they are caught . The returns substantiate the theory previously The distance from which transported bats advanced that even the cave bats may migrate have ...
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