There is no chicken breed that lays black eggs, even though there are some black chicken breeds like Ayam Cemani, Black Copper Maran, Silkie chicken, Black Australorp, Minorca, and Sumatra chicken. The eggs of Ayam Cemani, for example, are actually cream-colored with a slight pink hue. However, there are other birds that lay black eggs, such as the Emu and the Cayuga duck. The eggs of the Cayuga duck are laid at the beginning of the season and can gradually get lighter and lighter as they lay. Additionally, in Japan, there is a place called Hakone’s Hell Valley where they boil eggs in hot springs, and the naturally occurring sulfur colors the eggs charcoal black.