<unk> s, of the genus Dendroaspis, are fast-moving tree-dwelling snakes of Africa.  ("Dendroaspis" is literally "tree snake".) They belong to the family of Elapidae which includes cobras, coral snakes, kraits and, debatably, sea snakes, all of which can be extremely deadly. The black<unk>  is the longest venomous snake in Africa, with an extremely potent neurotoxic venom that attacks the nervous system, and cardiotoxins which attack the heart; the bite is often fatal to humans without access to proper first aid and subsequent antivenin treatment, because it shuts down the lungs and heart. Prior to the availability of antivenom, envenomations by members of this genus carried a nearly 100% fatality rate. However, with antivenom being much more available today, fatalities have become much more rare.
The Western green<unk>  (D. viridis) and Eastern green<unk> , (D. angusticeps), possess venom that is roughly equal in potency to that of the Black<unk>  (D. polylepis). However, they are not nearly as aggressive. 
They are slightly smaller, and are arboreal, whereas the latter is primarily terrestrial.
The black<unk>  is not named for the colour of its body (which is usually a shade of grey or charcoal), but for the highly pigmented interior of its mouth, which it will display to the predator in hopes it will leave it alone. Many people believe that the Black<unk>  will actually chase and attack humans. This is a myth, and is probably fueled by the great speed with which this species can move. Humans are actually their predators, rather than their prey. For that reason,<unk> s generally avoid contact with humans. However, if a<unk>  feels threatened by a human, it may defend itself fiercely.
In contrast to all other species in this genus, which are arboreal, black<unk> s reside in hollow insect mounds, abandoned burrows, and rock crevices. They are diurnal.  During the day they actively hunt their prey of small<unk> ls, birds and lizards. They return to the same lair nightly.<unk> s are related to the cobras (Elapids), as can be seen during their threat display, when they stretch a slightly smaller 'hood' while gaping their mouth. Unlike most other snakes<unk> s will strike repeatedly if cornered, and have been reported to bring down a giraffe and a lion with their venom.
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