About Aegithalos concinnus (Gould, 1855)
The black-throated bushtit, with the scientific name Aegithalos concinnus (Gould, 1855), is a small passerine bird. It measures around 10.5 cm (4.1 in) in length and weighs 4–9 g (0.14–0.32 oz). Plumage shows considerable variation across its different races, but all subspecies share several key traits: a medium-length tail (unlike the long tail of the related long-tailed tit), a black throat, and a black 'bandit mask' around the eye. The nominate race has a chestnut cap, chestnut breast band, chestnut flanks, dark grey back, wings, and tail, and a white belly. Other subspecies generally follow the same pattern as the nominate, but lack the chestnut breast band, and have either grey caps or entirely grey bellies and flanks. Males and females look identical. This species ranges from the foothills of the Himalayas, across northern India, through northeastern Bangladesh, Nepal, Bhutan, northern Myanmar, Vietnam, and Taiwan. Disjunct populations are also found in southern Vietnam, eastern Cambodia, on the island of Hainan, and as far north in China as the Yellow River. It inhabits open broadleaf forest and pine forest, and generally occurs at middle altitudes.
