Why is my brother vomiting?

My elder brother vomits is usually due to illness.This bird usually starts with young birds and chooses young birds with head nests.If you usually feed, it mainly uses egg rice or artificial feed. Because of its large amount of food, there are more excretion, and the stool has a smell. Therefore, you must clean the bottom of the cage and dung plate every day.In addition, this bird's adaptability to the environment is not strong, so pay attention to sun protection and frozen.