Bamboo woodpecker, Gecinulus viridis

Appearance

The male bamboo woodpecker has a pale buff-yellow or golden-brown olive-brown forehead, eye area, lores, base of the bill, and cheeks; olive-yellow sides of the neck, nape, and hindneck; and a large pink or bright red patch on the crown. The rest of the upperparts are chestnut-red or pale yellowish-olive-green. The wings are dark brown, with discontinuous brownish-yellow or buff-yellow bars on the primary flight feathers, the inner edges of which are red, gradually increasing in color towards the back, until the secondary flight feathers are completely the same color as the back. The tail is dark brown with brown bars at the base, and chestnut-red or red edges on the outer feathers. Alternatively, the tail may be reddish-brown with five pale chestnut bars. The chin and throat are pale olive-green, and the rest of the underparts are dark olive-green or olive-brown. The female is similar to the male, but the crown and nape are pale yellowish-green instead of red. The iris is dark red or brownish-red, the bill is pale bluish-grey or lead-blue with a pale horn-yellow tip, the legs are lead-green, and the claws are pale greenish-yellow. It has only three toes.
The Yunnan subspecies of the Bamboo Woodpecker has an olive-golden head, olive-yellow upperparts, a black tail with an olive base, and olive-brown underparts. The male has a scarlet crown and nape. The Southeast Asian subspecies has a pale buff head, olive-green upperparts tinged with red, a scarlet-brown tail with light chestnut horizontal bars, and dark olive-green underparts. The male has a rose-red crown and nape tinged with orange-yellow.
Size measurements: males weigh 76 grams, body length 230-251 mm, bill length 21-24 mm for males and 20-21 mm for females, wings 125-140 mm for males and 135-138 mm for females; tail length 92-102 mm for males and 94-103 mm for females; tarsus length 20-22 mm for males and 21 mm for females.