Acromelanism

Acromelanism is a genetic condition that results in pigmentation being affected by temperature. Generally it creates a colourpoint pattern where the main body is light while the colder parts such as legs and ears are dark. It is commonly known for the colouration of Siamese, and other colourpoint cats, but can be found in many other species including dogs, rabbits, rats, mice, guinea pigs, minks, and gerbils. It is a specific type of point colouration, as the extremities of an animal are a different colour to the rest of the body.