The black color of Ayam Cemani is not limited to its feathers – the color is all over and even on the inside. Everything about this chicken is black – skin, beak, plume, tongue, legs, toe nails, even its meat, bones, and organs. Even bone marrow is black.
20 Animais com cores que você nem imaginava que existia
"A chicken called the Ayam Cemani. The bird is inky black from the tip of its comb to the end of its claws, with blue-black skin, jet-black eyes, and a black tongue. It is covered in shimmering metallic black feathers, and even its internal organs are black."
Ayam Cemani is an uncommon and relatively modern breed of chicken originating in Indonesia. They have a dominant gene that causes hyperpigmentation (also termed as Fibromelanosis) leading to the skin, feathers and even the internal organs appearing dark black.