What causes the cockscomb to turn purple?

The weather is the main factor. I have more than a thousand animals at home. This happened a few days ago. It was mainly due to lack of water. Some of them had purple tails. It was not too much. They were mentally and eating normally. , it’s not very serious, you’d better get more drinking fountains and put them under the shade of a tree, so that they can drink from them at any time. If they all turn purple, you should pay attention? It is best to check if there is any epidemic situation in your local area.

Hope this helps