The kakapo is one of the largest species of parrot in the world with the average adult kakapo growing to around 60 cm in height. The kakapo is the heaviest species of parrot in the world and it is due to this weight that the kakapo is one of the few bird species that is unable to fly.
The kakapo is native to the forests of New Zealand and the kakapo is not found in the wild anywhere else in the world. The flightless kakapo is thought to have once thrived in it's New Zealand habitat due to the fact that there were no mammals that would hunt the kakapo, and this is thought to be another reason as to why the kakapo has evolved to be a ground dwelling bird.