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Spinus thibetanus
Habitat
Breeds in mixed forest; winters in alder
Size
About 12cm including the tail
It lacks yellow panels on its wings in all plumages; adult males have olive-greenish upperparts, yellow underparts, yellowish-green rumps and a yellow eyebrow and border behind the ear coverts, and the wing and tail feathers are broadly differentiated by a yellowish-green colour (Wikipedia, general species account).
Tibetan serins generally breed in mixed forest and spend the winter in alder, in the central and eastern Himalaya (Wikipedia, general species account).