Blue tits are fond of nesting in almost any hole, be it a tree, a nest box or 'hole in the wall'. Blue tit nests can be made from a range of materials, primarily moss, wool and dead leaves
Females of the species are responsible for nest building as well as incubating the clutch of eggs. Clutches typically consist of between 10 and 12 eggs, and these are laid specifically at a time of the year when green caterpillars are abundant, providing nutritious sustenance early on. Both parents are involved in feeding the young birds.
Blue tits begin breeding in March and April, and it's possible to see the young around 15-23 days later.
