Adult Size: The smallest of the 4 species of mambas, most eastern green mambas are adult at 6 to 7 feet in length. However, occasional examples may attain 8 to 8½ feet.
Range: This snake ranges southward from Tanzania to eastern Zimbabwe and coastal Natal in southern Africa.
Habitat: In keeping with its velvety bright green color, this slender, graceful, alert, serpent is persistently arboreal. This is a species of woodlands and coastal bushlands. Although normally arboreal, it occasionally descends to the ground to forage. If startled it will almost invariably ascend the nearest tree and escape through the foliage.
Captive Lifespan: 12 to 20 Years
Care Level: Advanced
This snake is dangerously venomous. As it is with all mambas the elongate, flat-sided head is often referred to as coffin-shaped. When stressed an eastern green mamba may elevate the forward portion of its body and flatten its neck into a narrow but discernible hood. They can and may gape and hiss, but are less likely to do so than the black mamba.
Hatchling (they are about 15 inches long when emerging) and juvenile green mambas can be kept in terraria of 20 to 50 gallon capacity. An adult will require a minimum of a 100 gallon capacity or larger cage. The terrarium should be well ventilated and have a foolproof locking top. Fortunately, most captive green mambas will readily accept a small hidebox with a locking door (called a trapbox). They prefer that the box be situated in an elevated position. Once the snake is securely locked in the box, the box and the snake it contains, can be safely moved. The trapbox will be most readily and continually accepted if it is located in a quiet area of the cage and is always in the same place. Sturdy, well anchored, horizontal climbing limbs will be readily used. To facilitate the handling of this dangerous snake the cage design should be simple but effective.
Certainly, once the snake is inside the careful closing and locking of the trapbox door and then the moving of the box is the safest of all methods. Barring that, the use of a clamp stick is the next safest method, but due to the speed, agility and size of this dangerous snake even the deft use of a clampstick is an accident in waiting. Seek the help of an experienced elapine keeper, heed all admonitions given.
A temperature gradient of several degrees should be provided. At the cool end of the terrarium a temperature of 74 degrees Fahrenheit is suitable but the warm end should be 84 to 86 degrees. A basking hotspot of 94 to 100 degrees will be utilized during thermoregulation.