Why is the white waist bird vomiting?

White waist birds may eat too much.Its foods are preferred, and they prefer to eat the seeds of plants. Therefore, they usually use rice as the main food. Some insects can be added in summer, and egg rice should be used during reproduction.It is worth mentioning that because this bird's nest is very strong, it can be used to incubate other birds, as long as it uses enough food and water, and controls the temperature.