The gang-gang cockatoo (Callocephalon fimbriatum) is a parrot found in the cooler and wetter forests and woodlands of Australia, particularly alpine bushland.

It is easily identified by its distinctive call, which is described as resembling a creaky gate, or the sound of a cork being pulled from a wine bottle.

[2] In 1803 the British Royal Navy officer James Grant included an illustration of the gang-gang cockatoo in his book describing a voyage to the colony of New South Wales in Australia.

[3] The gang-gang cockatoo is now the only species placed in the genus Callocephalon that was introduced in 1837 by the French naturalist René Lesson.

[5] The classification of the gang-gang cockatoo has always been controversial due to the unusual appearance and coloration of the bird, especially its sexual dichromatism.

[8] However, more recent molecular phylogenetic analysis places it in the Cacatuinae clade, not the Calyptorhynchinae, and having diverged from the palm cockatoo (Probosciger aterrimus).

Juvenile males can be distinguished by their brighter crowns and shorter crests, but otherwise look similar to the adult female.

The birds will lay 2-3 white eggs, the incubation period is 4 weeks and both sexes take care of the young.

[18] This protection status as a threatened species makes it a Tier 1 criminal offence for a person or corporation to knowingly damage the bird's habitat.