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<blockquote data-quote="James Lowther" data-source="post: 2426613" data-attributes="member: 9107"><p>hi ian,</p><p>not really a full answer but according to the alstrom paper they are diagnosable on the wintering grounds by call (and morphology? - field guides i have show xanthodryas as distinctly more yellow below but not sure how useful this is in real life) and they have confirmed occurrence of borealis from the thai-malay peninsula, borneo and the philippines. Examinandus lecotype is from Bali, so probably there is a big overlap in wintering/passage ranges. Both birds of SE Asia and birds of Borneo guides illustrate both borealis and xanthodryas, suggesting both occur.</p><p>cheers,</p><p>James</p></blockquote><p></p>
[QUOTE="James Lowther, post: 2426613, member: 9107"] hi ian, not really a full answer but according to the alstrom paper they are diagnosable on the wintering grounds by call (and morphology? - field guides i have show xanthodryas as distinctly more yellow below but not sure how useful this is in real life) and they have confirmed occurrence of borealis from the thai-malay peninsula, borneo and the philippines. Examinandus lecotype is from Bali, so probably there is a big overlap in wintering/passage ranges. Both birds of SE Asia and birds of Borneo guides illustrate both borealis and xanthodryas, suggesting both occur. cheers, James [/QUOTE]
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