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 kakapo is believed to employ bacteria in the fore-gut to ferment and help digest plant matter. Kakapo diet changes according to the season. The plants eaten most frequently during the year include some species of "Lycopodium ramulosum", "Lycopodium fastigium", "Schizaea fistulosa", "Blechnum minus", "Blechnum procerum", "Cyathodes juniperina", "Dracophyllum longifolium", "Olearia colensoi" and "Thelymitra venosa". Individual plants of the same species are often treated differently. Kakapo leave conspicuous evidence of their feeding activities, over feeding areas that range between and per individual. Kakapo feeding grounds almost always host manuka and yellow silver pine ("Lepidothamnus intermedius") scrubs. Fossil records indicate that in