Kakapo the reason for its massive decline since the introduction of dogs, cats and mustelids (see "Conservation: Human impact"). The kakapo is the only species of flightless parrot in the world, and the only flightless bird that has a lek breeding system. Males loosely gather in an arena and compete with each other to attract females. Females listen to the males as they display, or "lek". They choose a mate based on the quality of his display; they are not pursued by the males in any overt way. No pair bond is formed; males and females meet only to mate. During
Kakapo from her nest to a food source up to away and the male may walk from its home range to a mating arena up to away during the mating season (October–January). Young birds indulge in play fighting, and one bird will often lock the neck of another under its chin. The kakapo is curious by nature and has been known to interact with humans. Conservation staff and volunteers have engaged extensively with some kakapo, which have distinct personalities. While they are curious toward humans, kakapo are not social birds. The kakapo was a very successful species in pre-human New Zealand,