Japanese Journal of Ornithology
Online ISSN : 1881-9702
Print ISSN : 0040-9480
Ecological study of the Tree Sparrow Passer montanus
1. Age and sex identification
Taro Hashimoto
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1962 Volume 17 Issue 79-80 Pages 163-171

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Abstract

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).

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© The Ornithological Society of Japan
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