Black-browed Bushtit
Aegithalos iouschistos
It is a small, long-tailed bird, 11–12 centimetres (4.3–4.7 in) long. It has grey upperparts, rufous breast and flanks and a white belly. The head is buff with a broad black mask, white forehead and a white bib, speckled black in the centre. The subspecies A. b. sharpei has white rather than buff on the head, a dark breastband and a buff belly.
ID text from Wikipedia, CC BY-SA 4.0
Black-throated Bushtit
Aegithalos concinnus
The black-throated bushtit is a small passerine, around 10.5 cm (4.1 in) long and weighing 4–9 g (0.14–0.32 oz). 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.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black-browed Bushtit and Black-throated Bushtit.