What happened to the hair on the chest of the pigeon

The hair loss on the chest of the pigeon may be a normal hair change, or it may be infected with parasites.Generally, from July, the pigeons will start to change hair, and it will not be completely changed until 19 October.Pigeons are raised around the world, which can be used to communicate and compete.There are many varieties of pigeons, and the feathers are rich in color, including green, white, black, green, red and other colors.The pigeons are mainly eaten by cereals and rarely eat insects.