The Kakapo Recovery programme has been successful, with the numbers of kakapo increasing steadily. Their closest relative is the flightless kakapo ("Strigops habroptilus"). Codfish Island is home to Sirocco, an internationally famous kakapo, a rare species of parrot. The kakapo is a large, rotund parrot. It holds the majority of the breeding population of critically endangered kakapo. The kakapo has a larger pelvis than other parrots. The skeleton of the kakapo differs from other parrots in several features associated with flightlessness. One famous translocation was of the kakapo of New Zealand. A study in 1984 identified 25 plant species as kakapo food. The conservation of the kakapo has made the species well known. By the early 1970s, it was uncertain whether the kakapo was still an extant species. The kakapo is considered to be a "habitat generalist". The beak of the kakapo is adapted for grinding food finely. This manifests in lower disease resistance and fertility problems&colon; 40% of kakapo eggs are infertile.