The Country Naturalist

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منابع مشابه

The American Midland Naturalist

—Ascertaining the functions bird song requires information about when and where a song or, for males with multisong repertoires, songs are used. Because the need for and type of communication with mates and conspecifics changes with breeding stage and social context, detailed observations may reveal differential use of song or of different song types. Our objective was to examine the use, and d...

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The American Midland Naturalist

—Defining the trophic position of stream organisms is a first step in understanding the ecology of lotic systems. Whereas trophic positions of stream fishes have been traditionally assigned based on dietary analysis, stable isotope ratios may provide additional information on the validity of this approach and may be used to verify energy acquisition assumed from dietary studies. In this study, ...

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The Psychology of the Naturalist

Probably primitive man recognised the value of birds as food well before his mind became capable of understanding his jealousy of their powers of flight. That humans have long considered flying to be desirable is shown by early artists portraying angels, as spiritual super-humans, with functional wings; also, Peoples such as the Assyrians carved bulls complete with wings, thus representing both...

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ژورنال

عنوان ژورنال: Nature

سال: 1953

ISSN: 0028-0836,1476-4687

DOI: 10.1038/172324a0