The reason for the sparrow does not hatch eggs

The sparrows may not be frightened.In addition to winter, this bird can be reproduced. Usually, after pairing of male and female birds, it will choose the right place to build nests. Nests are generally made of dry grass, wool and feathers, and they are relatively simple.It can produce 4-6 eggs at a time, color gray-white, and brown spots on it.After spawning, the male and female birds are incubated in turns. After 11-12 days, the chicks will go out of the shell.