Here are two Black-naped Orioles of the same subspecies group. Both are said to be Sunda = maculatus group, although--based on range--both should actually be Chinese/East Asian = diffusus, but never mind; the important thing is that they are both supposed to be of the same subspecies group.
1) At the base of the Malayan peninsula (Kaeng Krachan, Thailand), 15 March
macaulaylibrary.org
2) At the tip of the Malayan peninsula (Johor, Malaysia), 22 April
macaulaylibrary.org
Why the striking difference in bill size and the somewhat smaller difference in the extent of the black mask (thick vs thin line behind the eye)?
Could the smaller bill suggest that one should at least consider vagrant Indian Golden Oriole for the second picture?
macaulaylibrary.org
Photos of the first two Thai records of Indian Golden Oriole:
media.ebird.org
EDIT: Or maybe one is East Asian/Chinese BNO and the other one is Sunda BNO akin to the difference between thise two?
macaulaylibrary.org
macaulaylibrary.org
(Maybe, but--then--these subspecies look very different.)
not sure what to make of this picture*:
commons.wikimedia.org
*confusingly, East Asian/Chinese = diffusus, while chinensis = Philippine
1) At the base of the Malayan peninsula (Kaeng Krachan, Thailand), 15 March
ML204577281 - Black-naped Oriole (Sunda) - Macaulay Library
Macaulay Library ML204577281; © Marco Valentini; Phetchaburi, Thailand
2) At the tip of the Malayan peninsula (Johor, Malaysia), 22 April
ML424726901 - Black-naped Oriole - Macaulay Library
Macaulay Library ML424726901; © GARY DOUGLAS; Johor, Malaysia
Why the striking difference in bill size and the somewhat smaller difference in the extent of the black mask (thick vs thin line behind the eye)?
Could the smaller bill suggest that one should at least consider vagrant Indian Golden Oriole for the second picture?
ML316546351 - Indian Golden Oriole - Macaulay Library
Macaulay Library ML316546351; © Amee Vyas; Ranga Reddy, Telangana, India
Indian Golden Oriole - Oriolus kundoo - Media Search - Macaulay Library and eBird
Explore millions of photos, audio recordings, and videos of birds and other animals; powered by Macaulay Library and eBird. The Macaulay Library collects, archives, and distributes wildlife media for research, education, and conservation.
EDIT: Or maybe one is East Asian/Chinese BNO and the other one is Sunda BNO akin to the difference between thise two?
ML70158841 - Black-naped Oriole - Macaulay Library
Macaulay Library ML70158841; © Kai Pflug; Shanghai, China
ML72256151 - Black-naped Oriole - Macaulay Library
Macaulay Library ML72256151; © Angela Christine Chua; Singapore, Singapore
not sure what to make of this picture*:
File:OriolusChinensisForms.svg - Wikimedia Commons
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