As readers might have noticed, I take every opportunity to rave about the birding in Beijing. One of the reasons is because there is so much opportunity for discovery. The last few weeks have proved this again.
Until now, Beijing birders had presumed all the LONG-TAILED ROSEFINCHES (Uragus sibiricus, 长尾雀), occasionally seen in the capital in winter, are from the population breeding in NE China, Russia and Mongolia (the ussuriensis subspecies). We don’t see many, and it was only after Paul Holt and I recently visited Wuerqihan, northern Inner Mongolia, where Long-tailed Rosefinches are common, that sharp-eyed (and sharp-eared!) Paul Holt suspected that the birds I had photographed and sound-recorded at Lingshan in October 2014 and November 2015 were of a different subspecies.
To compare, here are a couple of photos of the northeastern ussuriensis subspecies, the only race previously presumed to occurr in Beijing, taken in the Dalian area of NE China, courtesy of Tom Beeke.
And here is a male from Wuerqihan, Inner Mongolia.
Compare the calls of one of the Lingshan birds with a bird of the ussuriensis race from Russia :
Lingshan bird (lepidus):
Ussuriensis from Russia (Albert Lastukhin):
After comparing photos and sound-recordings of ussuriensis with those from Beijing, it became clear that the Lingshan birds were NOT of the ssp ussuriensis. Instead, the Lingshan birds show the characteristics (dark eye-stripe and brown wings on the male, heavy and contrasting streaking on the female) of the ssp lepidus, the race from central China (according to HBW, this subspecies ranges from Eastern Tibet, east to south Shaanxi and southwest Shanxi).
Photos prove that Long-tailed Rosefinches of the lepidus subspecies have now occured at Lingshan in October/November 2014 and again in November 2015, including adult males. This suggests that Lingshan may be a regular wintering ground for the lepidus subspecies.
This was quite a shock.
We don’t *think* lepidus breeds in Beijing – they are active and noisy during the breeding season and there have been a few spring/summer visits by birders to Lingshan in the last 2 years, during which one would expect these birds to have been detected had they been present. So, for the moment at least, it looks as if these birds have moved northeast from their breeding grounds, an unexpected winter movement.
We know that at least some of the few winter records of Long-tailed Rosefinch from lowland Beijing are of the northern subspecies ussuriensis. So Beijing has now recorded two ssp of Long-tailed Rosefinch.
It’s another fascinating, and unexpected, discovery from Lingshan! What next?
Big thanks to Paul Holt for the initial discovery, to Paul Leader for comments and to Tom Beeke for permission to use his photos of Long-tailed Rosefinch from Liaoning Province.