Kakapo low. Supplementary feeding affects the sex ratio of kakapo offspring, and can be used to increase the number of female chicks by deliberately manipulating maternal condition. During the winter of 1981, only females lighter than were given supplementary feeding to avoid raising their body condition, and the sex ratio results in 1982 were close to parity, eliminating the male-biased sex ratios in the unrestricted feeding. Today commercial parrot food is supplied to all individuals of breeding age on Whenua Hou and Anchor. The amount eaten and individual weights are carefully monitored to ensure that optimum body condition is maintained. Kakapo
The Mockery Bird population of Mockery Birds still live in the valley! Peter's discovery attracts the attention of the world press, environmentalists, politicians and businessmen from all around the world, and this leads to a couple of adventures. Finally, Professor Droom, a biologist, discovers that the main and only agricultural product of Zenkali, the Amela tree is ecologically linked to the Mockery Birds (explained below), so the flooding of the valley will make the island's economy collapse. Consequently, the construction of the airport is cancelled. The fictitious bird species of the book, the Mockery Bird is a flightless bird about the size of