Here is a gray jungle fowl I hatch this year when it hatch it was darker than any I have ever hatched and I have been raising them for years. I have talk to several other breeders and they said they have never seen one this dark and think it a dark color mutation.
![46579_100_1502.jpg](https://www.backyardchickens.com/forum/uploads/46579_100_1502.jpg)