Swiss Chocolate is a recessive colour mutation that accelerates melanin production. Swiss chocolate has a higher concentration of melanin on the head than on the rest of the body. This gives the head a dark colouration. Swiss chocolate hatch out pretty dark and keep that dark colour troughout their life. Swiss chocolates have more colours on the yellow spectrum with a more pixelated background, whereas sables have more colours on the green spectrum. Most swiss chocolate males have a lighter colouration on the body, than the females.