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나잇버더님 제 답글에 답글 감사합니다. 저는 전문가가 아니라 단지 제 느낌과 찾아본 글중 일부를 인용했을 뿐입니다. 선생님 말씀대로 흰색이 넓게 나타난 것은 Leucistic change라고 생각합니다. 그러나 이러한 leucismdl 대부분 domestic graylag에서 나타난다고하고(Leucistic Greylag Geese
Individuals showing white, partially white or paler than usual plumage are often found among feral goose flocks and these birds are generally assumed to be of domestic stock, or descended from domestic birds. Domestic birds certainly do find there way into feral flocks and will happily breed with feral birds, so this is probably a fair assessment in the majority of cases.) 부리에 검은점이나 부리 접합부 검은색이 domesic swan goose간은 다른 선조를 암시한다고하여 (Greylag Goose, Martham Broad (Norfolk, UK), 25th April 2009 - this bird shows a dark tip to the bill and dark along the cutting edge of the mandibles, which, as mentioned above, is not typical of pure Greylag Goose. These may be indicators of another species in its ancestry, probably domestic Swan Goose, however these birds do not appear to be first-generation hybrids and I am not certain if these features could ever appear on a 100% pure Greylag Goose.) 짧은 소견을 말씀드린 것입니다. 혹시 변역을 잘못 했을 수도 있고요. 아무쪼록 결론을 내려주세요. (제가 읽은 곳: http://www.gobirding.eu/Photos/GreylagGoose.php)
2013.01.29 09:53