* Slow reproduction: Kakapos have one of the lowest reproductive rates of any bird species. Females only produce one to two eggs every two to four years, and only about half of those eggs hatch.
* Long lifespan: Kakapos can live for up to 90 years, which means that they have a long period of time during which they are vulnerable to predation and habitat loss.
* Nocturnal habits: Kakapos are nocturnal, which makes them more vulnerable to predators that hunt at night.
* Poor camouflage: Kakapos have a distinctive green plumage that provides little camouflage in their forest environment.
Environmental factors:
* Habitat loss: The kakapo's natural habitat is the forests of New Zealand, but much of this habitat has been cleared for agriculture and other development.
* Predation: Kakapos are preyed upon by a variety of animals, including cats, dogs, ferrets, and rats.
* Disease: Kakapos are also susceptible to a number of diseases, including avian tuberculosis and chlamydiosis.
The combination of these characteristics and environmental factors makes the kakapo one of the most vulnerable bird species in the world. There are only about 200 kakapos left in the wild, and they are only found on two small islands off the coast of New Zealand.