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[China] Huiyang County, Dayawan

I am rather struck on this House Sparrow and also on the male that has been in Long Valley how pale the bill is. Most male House Sparrows I have seen in United States have all black bills. I wonder if that is a feature of bactrianus.

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John, what feature allow for separation between domesticus-type and bactrianus? I haven't found much literature on this.

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