What is the primary characteristic of kakapos that sets them apart from other parrot species?

The primary characteristic that sets kakapos apart from other parrot species is their flightless nature. Unlike most parrots, which are adapted for flight with strong wings and feathers designed for soaring and agility in trees, kakapos have evolved to live on the ground and glide short distances due to their body structure and lifestyle. This adaptation has resulted from their natural habitat in New Zealand, where they face fewer aerial predators and can rely on their strong legs for mobility.

Kakapos are unique among parrots not only for being flightless but also for their nocturnal behavior and specific reproductive strategies, which are significantly different from many other parrot species. Their flightlessness limits their dispersal and makes them vulnerable to introduced predators, thus highlighting the importance of conservation efforts for this critically endangered bird.