The black-throated bushtit (Aegithalos concinnus), also known as the black-throated tit, is a very small passerine bird in the family Aegithalidae.
The species has six currently recognised subspecies, and several others have been suggested. Genetic studies have suggested that these subspecies may represent separate species, but further research is needed
The black-throated bushtit is a small passerine, around 10.5 cm long and weighing 4-9 g.There is considerable racial variation in the plumage, but all subspecies have a medium length tail (as opposed to 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, breast band and flanks and dark grey back, wings and tail, and a white belly. The other subspecies have generally the same pattern (minus the chest band) but with grey caps or all grey bellies and flanks. Both sexes are alike.