The Orange-bellied Parrot is endangered in south-eastern Australia. In the winter it is dispersed over a long band of coastal habitat ranging from Victoria to South Australia. The present model study compares the benefits of habitat management in the Victorian and the South Australian parts of the winter habitat. Various management options are compared in a sensitivity analysis. The results show that management in Victoria has a stronger influence on the population than management in South Australia. The population parameters are subject to considerable uncertainty. The sensitivity of the results to the values assigned to the model parameters is explored. The results are valid over a wide range of the plausible parameter space.