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The island observatory also ringed a Siberian chiffchaff.
Ynys Enlli (Bardsey) had a great week, with an Eastern Subalpine Warbler, Golden Oriole, Blue-headed Wagtail, Siberian Chiffchaff and a possible Siberian Lesser Whitethroat - although its certain identity awaits a DNA test in an Aberdeen laboratory.
One was over Bardsey this week and another (or the same) over southwest Llyen, where a possible Siberian chiffchaff was at Porth Meudwy.
A Siberian Chiffchaff was on the Great Orme, along with Firecrests, Lapland Bunting and a Richard's Pipit, with more Firecrests at RSPB Conwy and Bardsey.
It was a splendid afternoon to look for the male Siberian chiffchaff reported singing around the large pond there.
A probable Siberian Chiffchaff was ringed at Penygroes, though arguments still rage in birding circles about how to identify this eastern subspecies.
Much rarer are Siberian Chiffchaffs, seen on Bardsey and the Great Orme, which also each hosted a Yellow-browed Warbler.
Bardsey Bird Observatory finished its autumn season with a flourish: Red-breasted Flycatcher, Barred Warbler, six Siberian Chiffchaffs and at least 10 Yellow-browed Warblers.