Hey, I have quite a few of this in my garden. They are all juveniles and only about 30cm long. Some have already been killed by my dogs. Two I managed to save though :-) They are Crotaphopeltis hotamboeia. They are mildly poisonous and their fangs are right at the back of their mouths. Not dangerous at all but because they put up such a fight when molested, few people have the guts to grab them. Here is a YouTube video clip.