The common wolf snake is a species of nonvenomous snake which is widespread in the Indo-Australian Archipelago although it is an invasive here in New Guinea. It is well established in the town I live in (pers. obs.).
Entered my house in a semi-urban neighborhood of houses, gardens and a patch of disturbed remnant forest. It is often found in buildings.
We were paid a visit tonight by this feisty and very aggressive wolf snake inside the house. Besides biting (or trying to -- it had a very small mouth; see the last 3 photos), it also gave us a bit of musk to contend with. By the end of the photo shoot it had calmed considerably.