The '''Oenpelli python''' ('''''Nyctophilopython oenpelliensis''''' or '''''Morelia oenpelliensis''''' by some authorities) is a [[species]] of large [[snake]] in the [[Family (biology)|family]] [[Pythonidae]]. The species is [[Endemism|endemic]] to the [[sandstone]] [[massif]] area of the western [[Arnhem Land]] region in the [[Northern Territory]] of [[Australia]].<ref name="NT threatened"/> There are no [[subspecies]] that are recognised as being valid.<ref name="ITIS">{{ITIS|id=634779|taxon=''Morelia oenpelliensis ''|access-date=2007-09-19}}</ref> It has been called the rarest python in the world.<ref>{{cite video|url=https://www.youtube.com/watch?v=yabmq1pTpn8|title=Rarest Python in the World|date=18 December 2013|publisher=SnakeBytesTV|access-date=2016-02-04}}</ref><ref>{{cite video|url=https://www.youtube.com/watch?v=otbw8pSC114|title=Breeding plan aims to save snakes|date=29 March 2012|publisher=[[ABC News (Australia)]]|access-date=2016-02-04}}</ref><ref name=SydneySmith/> Two notable characteristics of the species are the unusually large size of its eggs and its ability to change colour.<ref name=JCM/>
