earlytorise
Well-known member
Hi, I live in Hong Kong. I would occasionally find what are presumably Sulphur-breasted Warblers in mixed flocks.
I am aware, however, that there is such a thing as Limestone Leaf Warbler. The paper describing this species is in this link.
I'd be curious to know how to detect a vagrant Limestone Leaf Warbler in Hong Kong. Unlikely, yes, but stranger things have happened in the world of Hong Kong birding.
Their vocalisations differ. I have never knowingly heard a Sulphur-breasted vocalising. I don't even know if anyone has ever heard the call in Hong Kong.
As for morphology, the paper says that the two appear indistinguishable in terms of plumage. Apparently, Limestone is slightly colder-coloured than Sulphur-breasted, though this is based on two specimens of the former. Also, the authors claim that the ratios of bill length to wing length don't overlap. I don't know if this ratio can be measured from a series of good photos in the field.
This paper, however, is a bit old. I wonder if there is now more data or more updated studies.
Cheers!
I am aware, however, that there is such a thing as Limestone Leaf Warbler. The paper describing this species is in this link.
I'd be curious to know how to detect a vagrant Limestone Leaf Warbler in Hong Kong. Unlikely, yes, but stranger things have happened in the world of Hong Kong birding.
Their vocalisations differ. I have never knowingly heard a Sulphur-breasted vocalising. I don't even know if anyone has ever heard the call in Hong Kong.
As for morphology, the paper says that the two appear indistinguishable in terms of plumage. Apparently, Limestone is slightly colder-coloured than Sulphur-breasted, though this is based on two specimens of the former. Also, the authors claim that the ratios of bill length to wing length don't overlap. I don't know if this ratio can be measured from a series of good photos in the field.
This paper, however, is a bit old. I wonder if there is now more data or more updated studies.
Cheers!
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