What breed is a black chicken?

Online Answer
Ayam CemaniThe Ayam Cemani—an inky black chicken breed indigenous to Indonesia—is known by many names: among others, the "world's most bewitching chicken," the "Lamborghini of poultry," the "Goth chicken" and the "Sith Lord bird.
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Ayam Cemani are black because of hyperpigmentation due to a condition called fibromelanosis. Scientists believe that this condition is caused by an excessive amount of pigmentation in the chicken's tissues. The pigmentation occurs when the EDN3 gene is over-produced.
There are a few reasons why this chicken has such a steep price. The main one is because they are hard to breed. Hens sometimes have trouble laying eggs and will only produce about 80 eggs per year. ... Despite their rareness, the Ayam Cemani is in high demand.