Pallas’ Willow Warbler — Phylloscopus Proregulus (Pallas)
A single example of this Asiatic species has been obtained in Great Britain, its true home being across Eastern Siberia, where it nests from Lake Baikal to the Himalayas and Northern China. It closely resembles the Yellow-browed Warbler, but its colours are brighter. The crown stripe is well marked. The inner web of the outer tail feathers is not margined with white, but its most distinctive feature is the bright lemon yellow rump. Length 3·7 in.; wing 2 in.