Eurasian Blue Tit

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.