Very hardy birds too. Escaped/released ones have done quite well in establishing colonies and surviving harsh winters in the northern US:
BrooklynParrots.com: A Web Site About the Wild Parrots of Brooklyn: Photo-Essay: The Fabulous Wild Parrots of Chicago
BrooklynParrots.com: A Web Site About the Wild Parrots of Brooklyn: Photo-Essay: The Fabulous Wild Parrots of Chicago