The Coal tit has a distinctive large white nape spot on its black head. The head, throat, and neck of the adult are glossy blue-black, setting off the off-white sides of the face (tinged grey to yellow depending on subspecies) and the brilliant white nape; the white tips of the wing coverts appear as two wingbars. The underparts are whitish shading through buff to rufous on the flanks. The bill is black, the legs lead-colored, and the irides dark brown. The young birds are duller than the adults, lacking gloss on the black head, and with the white of nape and cheeks tinged with yellow.
Coal tits breed once per year between March and late July. They prefer to nest in a hole in a rotting tree stump, often low down, and the nest is deep within the hole; holes in the ground, burrows of mice or rabbits, chinks between the stones in walls, old nests of Pica magpies or other large birds, and squirrel dreys are also occupied. The materials, moss, hair, and grass, are closely felted together, and rabbit fur or feathers are added for the lining. The female lays 7 to 11 red-spotted white eggs and incubates them for 14-16 days. The chicks hatch blind and helpless and remain in the nest for about 14 to 19 days.
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