Atheris is a genus of venomous vipers known as bush vipers. They are found only in tropical subsaharan Africa (excluding southern Africa) and many species have isolated and fragmented distributions due to their confinement to rain forests. They are relatively small in size, with adults ranging in total length (body + tail) from 40 cm (16 in) to a maximum of 78 cm (31 in). All species have a broad, triangular head that is distinct from the neck. Not much is known about their venom except that it is strongly hemotoxic, causing pain, swelling and blood clotting problems.
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