African Blue Tit
Cyanistes teneriffae
The African blue tit ranges from 11–12 cm (4.3–4.7 in) in size. It is a small, sharp-billed, compact tit. The nominate race has a forehead and supercilium to centre of nape white, crown deep glossy blue, becoming blackish on the neck, with a blue dorsal and yellow ventral body. The song is a variable repetition of one or two notes.
ID text from Wikipedia, CC BY-SA 4.0
Eurasian Blue Tit
Cyanistes caeruleus
The Eurasian blue tit is usually 10.5–12 cm (4.1–4.7 in) long with a wingspan of 17.5–20 cm (6.9–7.9 in) for both sexes, and weighs about 11 g (0.39 oz). A typical blue tit has an intensely blue crown and a dark blue line passing through the eye and encircling the white cheeks and chin, giving the bird a very distinctive appearance. The forehead and a bar on the wing are white. The nape, wings and tail are blue, and the back is yellowish green. Voice: Eurasian blue tits use songs and calls throughout the year. Songs are mostly performed in late winter and spring to defend the territory or to attract mates. Calls are used for multiple reasons, the most important of which is communication with other Eurasian blue tits. They inform one another of their location in trees by means of contact calls.
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: African Blue Tit and Eurasian Blue Tit.