Black-crested Titmouse
Baeolophus atricristatus
The black-crested titmouse is about 15 cm (5.9 in) long and weighs about 16.5 g (0.58 oz). It is a moderately large member of its family and has a distinct crest. The sexes have the almost the same plumage. Adult males of the nominate subspecies B. a. atricristatus have the eponymous black crest; female's crests are dark gray. Both sexes have a buffy-white forehead, white lores, a white eye-ring with a black spot above it, and pale gray ear coverts. Their upperparts are deep plumbeous gray with a greenish cast on the mantle and rump. Voice: The black-crested titmouse's song is "five to seven rapidly delivered slurred phrases peew peew peew peew peew". One of its calls is "a series of angry, nasal, rising notes often preceded by very high, thin notes: ti ti ti sii sii zhree zhree zhree".
ID text from Wikipedia, CC BY-SA 4.0
Tufted Titmouse
Baeolophus bicolor
Measurements: Length: 14–16 cm (5.5–6.3 in) Weight: 18–26 g (0.63–0.92 oz) Wingspan: 20–26 cm (7.9–10.2 in) A small bird, the tufted titmouse has a white front and gray upper body outlined with rust-colored flanks. Other characteristics include its black forehead and the tufted gray crest on its head. In juveniles, the black forehead is greatly diminished such that it may be confused with the oak titmouse, although their ranges do not overlap. Males tend to be larger than females.
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-crested Titmouse and Tufted Titmouse.