Budgerigars are wandering birds found in open habitats, primarily in scrubland, open woodland, and grassland of Australia. The birds are normally found in small flocks, but can form very large flocks under favorable conditions. The species is extremely drifting, and the movement of the flocks is tied to the availability of food and water. Drought can drive flocks into more wooded habitat or coastal areas. They feed on the seeds of spinifex, grass seeds, and sometimes ripening wheat.
Naturalized feral budgerigars have been recorded since the 1940s in the St. Petersburg, Florida, area of the United States, but are much less common now than they were in the early 1980s. Increased competition from European Starlings and House Sparrows is thought to be the primary cause of the population decline.
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