Can bluebirds and males make nests out of grass?

The performance of the bluebird and the male bird is loud and continuous singing, and the female bird is seen chasing and stepping on her back. The female king and the male bird feed together. When the male bird approaches, she will attach herself and let the male bird step on her back. Generally speaking, male and female jade birds are separated by nets. If two birds feed each other through the net, they will be kept in a cage. Put some marijuana or fine grass in the cage. If the male bird steps on his back and the female bird grabs the grass, the female bird can lay eggs and breed within a week.