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

Brother's buttocks sticky shit is caused by disease.This bird is mainly eaten in insects, such as locusts, ravioli, termites, etc., but can also eat the fruits and seeds of figs and banyan fruits.There are more foods that can be accepted by artificially breeding. In addition to synthetic feed, you can feed it to eat bread worms, rice worms, vegetables and other insects. You can also choose rice, egg yolks, and fresh fruits and vegetables.Matching each other, you cannot only feed only one for a long time.