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Sand Martins, Tainan County, Taiwan

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Old Friday 15th September 2017, 16:52   #1
SteveMM
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Join Date: Jan 2015
Location: Tainan, Taiwan
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Sand Martins, Tainan County, Taiwan

I'm quite happy that the more bulky-looking individual (left, top, A respectively) is a Sand Martin, but what about the scrawny-looking one? Is this just excessively worn, some kind of runt, or a Pale Martin? It is quite distinctive whatever it is!

Any comments welcome!
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Old Saturday 23rd September 2017, 14:59   #2
SteveMM
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I'll try and bump myself back up by adding more photos (of new individuals)!

First off, is the clump of feathers on the tarsus of the first bird (06) within the range of ijimae Sand Martin? It looks to be on the extensive side.

Second, could the fact that all of these birds are in primary moult be taken to indicate that they are relatively local? If so, that would make them fohkiensis Pale Martin, and from the same population of birds that pass through Hong Kong. Such birds (Hong Kong) seem to moult much later in the winter than these Taiwan ones. Could timing of moult be at all useful in separating these two?

All questions and no answers, I'm afraid!

Steve
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