Bitis
Both the largest viper, and the smallest viper in the world belong in this group. The largest viper, the Gaboon Viper, grows up to the length of 2 meters, while the smallest viper, the Namaqua Dwarf Adder, grows up to the length of only 28 cm. All African Adders have wide, triangular heads, a large, rounded snout, and small eyes.