What is going on with hair on the neck of the pigeon's neck?

The hair on the pigeon's neck may be changing hair or getting sick.Changeing hair is the normal physiological characteristics of birds. For pigeons, it will change the hair once a year. As long as other parts are also losing hair, it basically proves that it is changed, so there is no need to worry.In addition, there are some diseases that cause pigeons to lose hair, which are usually caused by parasites. They need to be treated in time. Usually, pay attention to hygiene and wash it more.