This unique species lives in Indonesia and is considered a bird of the elite. And you can see why. The chicken is completely black – and yes, you’ve understood it correctly – completely means its internal organs and all of the inner side of this bird are black too. This happens due to a phenomenon of fibromelanosis, a harmless genetic mutation that causes extra melanin to seep into the bird’s tissue while it’s still at the stage of embryo – so they’re born all black too.