The Blue Tit is a cavity nester that uses ready-made cavities and readily takes to artificial nest boxes.
Nest site: tree holes, old woodpecker holes, nest boxes, and holes in walls and posts — often placed lower than the Great Tit's.
Builder: the female builds a nest of moss and lichen on her own, lined with hair, wool and feathers.
Brood: 8–12 eggs, one brood per season (sometimes two in the south).
Because the Blue Tit is smaller than the Great Tit, it can make use of tighter cavities, but it often competes with the Great Tit for the best nest sites.