There's no doubt at all that nature can come up with some awesome looking stuff. All over the world, various animals and plants use colour and visuals to attract mates, ward off predators and even disappear into their surroundings. One of the more interesting and stunning things to come out of the natural world is, scientifically speaking, a defect.
Every now and then you'll see a picture of an all-white or all black version of an animal. In the all-white case, this is Albinism and Melanism for the all black. Yes, they are genetic defects in the animal, but boy are they stunning ones.
Albinism is caused by a lack of pigmentation or colouring in an animal or plant, resulting in a pale or white appearance. Melanism is just the opposite, an overabundance of the protein melanin resulting in a black appearance. Not rocket science by any means.
Probably the most famous example of Melanism in the wild is the elusive Black Panther...no, not the Marvel superhero. The Black Panther isn't actually its own species; they are simply the Melanism version of a Leopard, Jaguar or Cougar living the Americas and Africa. The Black Panther is extremely rare, perpetuated into our common knowledge by ancient tales, myths and legends.