Melanism (also known as melanosis; from Greek μελανός, "dark-colored") is the occurrence of an increased amount of dark pigmentation (as of skin, feathers, eyes or hair) in an organism, resulting from the presence of melanin. It is the opposite of leucism and albinism, which occur because of a lack of melanin or other types of pigment. Abundism is the occurrence of excessively abundant dark markings (such as spots, stripes or other patch types) due to increase… (More on Melanism)