 The head has a characteristic V-shaped mark that may be solid black, or brown with a black outline.Rhombic night adder, demon night adder, Cape night adder, African night adder, Cape viper.Savannas of subsaharan Africa from Nigeria east to Sudan, Ethiopia, Somalia and Kenya, south through Tanzania, Uganda, Rwanda, Burundi, DR Congo, Angola, Zambia, Malawi, Zimbabwe, northern Botswana, Mozambique, Swaziland, and eastern South Africa to Riverdale in the Western Cape Province.