What are the causes of pigeons in winter?

In winter, the hair loss of pigeons may be caused by cold weather or sickness.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.