What's wrong with my brother's butt sticky shit

The naiger's butt sticky shit is because it has a cold or is not hygienic in diet. It should be treated with water in water. Usually pay attention to replace food and drink water, and also clean it.This bird's food is very wide. Wild ones can eat insects such as locusts, crickets, and tigers, and can also eat grains, plant fruits and seeds.Because of its large amount of food, more excretion and smell of smell, it must be cleaned regularly.