These snakes are small, growing to 2 feet, but have a deadly venom. They are native to the forests of West Africa. Horned adders are another type of venomous viper. They are short and stocky in appearance, with a flattened body and short tail. These snakes have a horn above each eye, and are generally coloured according to the soil on which they live, for camouflage purposes.
Horned adders are also small, being little longer than a foot.
They are found in the desert and semi-desert of south and south west Africa. Gaboon vipers are one of the larger types of vipers, growing up to 7 feet in length. They are large and heavy bodied, with a broad, flat triangular head and small eyes. They also have a small tail. They have a pattern consisting of diamonds, rectangles, and triangles similar in colour to leaf litter, which they often use as camouflage.