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Blue Tit Cyanistes caeruleus L 11-12cm. Familiar garden and woodland bird. Sexes are similar. Adult has greenish back, blue wings and yellow underparts. Mainly white head is demarcated by dark blue collar, connecting to dark eyestripe and dark bib; cap is blue. Bill is short and stubby and legs are bluish. Male is brighter than female. Juvenile is similar but colours are subdued. Voice Call is chattering tser err-err-err. Song contains whistling and trilling elements. Status Common resident of deciduous woodland, parks and gardens.