In Australian Aboriginal mythology, the large water monster said to lurk in swamps and billabongs is the bunyip.
Bunyip traditions are associated especially with southeastern Australia, where the creature is said to inhabit swamps, rivers, lagoons, creeks, waterholes, and billabongs. Descriptions vary greatly: some portray it as seal-like, while others give it a long neck, fur, tusks, or an emu-like head. That variation reflects the many Aboriginal traditions and language groups connected with the story.
The bunyip was not simply an Australian version of the Loch Ness Monster. In some traditions it was a dangerous spirit, while in others it helped enforce rules about waterways, fishing, and children approaching deep or unfamiliar water. Ngarrindjeri stories, for example, describe Mulyawonk as a water spirit that punished people who took too many fish.
The word entered written Australian English in the nineteenth century, but the beliefs are much older. Later European reports sometimes treated the bunyip as an undiscovered animal, adding cryptozoological details to an Indigenous mythological tradition.