Ecological study of the Tree Sparrow <i>Passer montanus</i>

DOI

Bibliographic Information

Other Title
  • 農村地帯に於けるスズメ群の生態
  • 1. Age and sex identification
  • 第一報野外個体群の年令及び性の識別について

Description

In this first report the following result on age & sex identification is described. 1. In April to July young are identified from adult birds by bill colour & paler black throat band. 2. In August & September, the base of the bill of adults becomes pale & indistinguishable from that of young birds. The moulting of throat band also makes the age identification difficult. 3. Those birds which have finished the first moult are to be separated as young birds from the 'Juveniles'. 4. In October to next March bill colour can be again an age criterion. 5. Sex identification was impossible other than gonad examination (measurements given).

Journal

Details 詳細情報について

  • CRID
    1390001205146240000
  • NII Article ID
    130003605618
  • DOI
    10.3838/jjo1915.17.163
  • ISSN
    18819702
    00409480
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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