Colubridae ~ Tree, Water, Mangrove & Slate Snakes
Tree Snakes: The largest snake family in the world with more than 1600 species, 10 of which are found in Australia. All are weakly venomous with fangs at the rear of the mouth. They differ from elapids by the possession of a loreal scale (extra scale between the eye and nostril). No Australian colubrid is considered dangerous but do not attempt to handle any snake without experience and guidance from a professional.
Reference: A Complete Guide to Reptiles of Australia