The National Geographic Magazine, Volume 87National Geographic Society, 1945 - Geography Indexes kept up to date with supplements. |
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Page 187
... bird , " which is called chachalaca in most parts of Mexico , showed that the birds kept their song time by the sun . Their regular evening recitals came later and later with the advanc- ing season until , by the end of April , it was ...
... bird , " which is called chachalaca in most parts of Mexico , showed that the birds kept their song time by the sun . Their regular evening recitals came later and later with the advanc- ing season until , by the end of April , it was ...
Page 721
... birds * and then to analyze the visible sound- track record and compute the exact changes in pitch of a bird's song . Indeed , the late Albert R. Brand , who started the bird - song recording project at Cornell , did exactly this for ...
... birds * and then to analyze the visible sound- track record and compute the exact changes in pitch of a bird's song . Indeed , the late Albert R. Brand , who started the bird - song recording project at Cornell , did exactly this for ...
Page 727
... birds started preening when they were six days old , they did not scratch until they were seven and did not start bathing until they were thirteen . These were all activities in which the young bird would engage for the rest of its life ...
... birds started preening when they were six days old , they did not scratch until they were seven and did not start bathing until they were thirteen . These were all activities in which the young bird would engage for the rest of its life ...
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