The sulphur-crested cockatoo is one of Australia’s most iconic — and loudest — birds, instantly recognisable by its brilliant white feathers and dramatic yellow crest. Found across much of the country, these highly intelligent parrots are known for their curiosity, problem-solving skills and absolute confidence in taking over backyards, parks and anything left unattended. They feed on seeds, nuts and roots, often in noisy flocks that are impossible to ignore. While still common, they rely on large old trees for nesting hollows, and habitat loss can limit suitable breeding sites — conservation efforts by organisations like Hollows as Homes help highlight the importance of protecting these vital spaces. Once they’ve decided your place is part of their territory, there’s really no negotiating with them.