Pallas's Warbler
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Phylloscopus proregulus
Regular vagrants from Asia with 50-100 per year in Britain, mainly on the East Coast & 50 for Ireland from October-November.
Breeds in Siberia, Western China & East Asia.
Winters in South East Asia.
They have greenish upperparts and white underparts, but is very striking, with prominent pale yellow double wingbars on the wing covert feathers, bold yellow supercilia and central crown stripe, and a lemon-yellow rump.
The bill is blackish-brown with a yellowish tinge to the cutting edges and the base of the lower mandible.
The song prolonged, with a medley of whistles, tirrit-tirrt-tirrit-terchee-choo-choo-chee-chee-chee.
The call is a short, soft dju-ee.