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Range DescriptionZandalatirostris is endemic to south-western Australia. Between the 1970s and 1990s, the species disappeared from over one third of its range (Saunders 1990), with both local extinctions and reduced density in occupied areas, although it has recently been expanding into partially cleared forest habitat along the western fringe of its former range. Its current range covers a large area from Kalbarri southeast to Esperance (DEC, Western Australia 2007b). Most breeding occurs between Three Springs and the Stirling Range and areas to the west (Cataby to Tone Rover) (DEC, Western Australia 2007b). The total population is estimated at c.40,000 individuals (DEC, Western Australia 2007b), now divided into four subpopulations: northern wheatbelt, upper southern wheatbelt, south-eastern wheatbelt and Esperance coast (DEC, Western Australia 2007b). Surveys carried out in the Swan region show that the number of roosting birds declined of 37% between 2010 and 2011 (Kabat et al. 2012). The number of roosts with 151-500 cockatoos reduced by 42% and no roosts had more than 500 birds. There was a 66% increase in the number of roosts that had 150 or fewer birds. Statistical modelling suggests that the total population for the Swan Region in now between 5,177 and 8,629 birds. Initial trends based on roost counts suggest that declines are continuing at a similar rate to historical range contractions, i.e. >50% in 3 generations (Garnett et al. 2011).