Deadly snakes include black and green mambas and boomslangs. The black mamba is actually brown, but its name comes from the black coloration of the inside of its mouth.
The black mamba is found from the horn of Africa to the south and east of the continent. It can grow up to 14 feet long and can move at 12.5 miles per hour. It is one of the most venomous snakes on Earth, and is responsible for many human deaths. Mambas are usually shy but attack when cornered. Their habit is to bite several times in rapid succession. The venom attacks the nervous system and the heart and can kill a person within 20 minutes if an antidote is not found.
The green mamba's venom also attacks the nervous system. Its green coloration makes it difficult to see as it rests in trees. Like the black mamba, it is slender and fast.
The boomslang is also found in Africa, and like the green mamba is slender, swift and lives in trees. However, it is only about 5 feet long. The females are greenish brown, but the males can come in many colors, including bright green. The boomslang has fangs in the back of its upper jaw and can fold its fangs into its mouth when they're not in use. It has an extremely wide gape, and its venom is a hemotoxin, which means it attacks the blood.