Jameson’s Mamba, Dendroaspis jamesoni, is one of the four species of Mamba, a venomous African snake. It is swift, arboreal, and has a very slender scaled body that is about 1.5 to 2.2 m long. Each scale is a shade of blue-green or yellow with a black outline. It has the duller green and is smaller, compared to the Western Green Mamba, which is a very close relative. Like other Mamba, they are diurnal. Venom is similar in composition to the Black Mamba’s but not as poisonous. Mamba bites can cause severe, even lethal systemic effects. Instant antivenin therapy is the most important treatment.