Why is Gray Bird vomiting?

Gray Bird's vomiting is usually due to estrus.It requires a cage with a suitable size, which must be installed with food boxes, water boxes, and water bath.The food box water box needs to replace new food and drinking water every day to prevent the health of the birds after its deterioration. The water bath device is used to take a bath for it, but be sure to keep warm to prevent birds from getting cold.When it is summer, pay attention to sun protection and ventilation.