What are the signs of the natal egg before getting eggs?

The elder brother's eggs will go in and out of the bird cage frequently, and they will also return with some branches and weeds to make it easier to make nests.Its breeding period is from April to August. The nest often has no fixed shape, and the niner in the wild will even concentrate on the nest.Each spawning can produce 3-6 pieces. The surface of the egg is blue-green, and at the same time, it is full of luster. Usually, it is incubated for about 16 days, and the chicks break out of the shell.