Which parrot is the world’s heaviest and cannot fly?

The kākāpō is the world’s heaviest parrot and cannot fly.

This nocturnal parrot is native to New Zealand and evolved without mammalian predators, so it developed strong legs and lost the ability to fly. It climbs trees and can glide down from branches, but it cannot sustain powered flight.

Adult kākāpō usually weigh about 1.5 to 3 kilograms, making them heavier than other parrots. Their moss-green feathers provide camouflage, while their sensitive facial feathers and whisker-like bristles help them navigate at night.

Kākāpō were once widespread across New Zealand, but introduced rats, cats, stoats, and dogs caused a severe population collapse. Conservation teams now manage every known bird on predator-free islands, where the species is carefully monitored and bred.