Cacatua galerita, commonly known as the Sulphur-crested Cockatoo, is native to Australia, Papua New Guinea, Indonesia, and the Aru Islands. Within Australia, they are found across the northeastern, northern, and eastern parts, including states such as Queensland, New South Wales, and Victoria.

The Sulphur-crested Cockatoo inhabits a variety of environments ranging from coastal forests, rainforests, and woodlands to more open environments like savannahs and farmlands. They are highly adaptable birds that can also thrive in urban areas where food availability is sufficient.

As a highly social and intelligent species, Sulphur-crested Cockatoos play a significant role in their ecosystem, particularly in seed dispersal due to their feeding habits. Their diet mainly consists of seeds, nuts, fruits, and occasionally insects. They are known for forming large, noisy flocks and often forage in groups, which aids in deterring predators.