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
Oak Titmouse
Baeolophus inornatus
Voice: The song of the oak titmouse is a series of repeated phrases of two or three notes with the last note of lower pitch; usually, three to seven phrases are grouped together. Vocal behavior differs between males and females for oak titmouse.
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 Oak Titmouse.