The orange-bellied parrot is a small bird, a little larger than a budgerigar (budgie). There may be as few as 150 orange-bellied parrots in the wild, making the species one of the worl's rarest birds. It is so rare that scientists fear it may soon become extinct. Where do orange-bellied parrots migrate to and from? Why are they critically endangered? And what is being done to protect them?