Among the non-venomous species, the commonest are the boa-constrictor, the anaconda (Eunectes murinus) and the ih'.
No part of the world possesses so many snakes of this sub-family as Australia, where, in fact, they replace the non-venomous colubrine snakes; many of them are extremely common and spread over a considerable area.
Serpents are very common, both venomous and non-venomous; the pythons attain a great size.