How old is the four happy birds that can have eggs

Sixi birds generally take more than one year to get eggs.Its breeding period is from April-July, and it will be August.Generally, the nests of dry grass, grassroots, thin branches, etc. are used, and pine needles, moss and so on inside.After the nest is built, the female birds begin to lay their eggs. There are 4-6 pieces of each nest. After delivery, the male and female birds are hatched together. Generally, it takes 12-14 days. After that, the birds will be brought together.