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Kiwi (Apterygiformes-Ratitae) |
The kiwi bird's name comes from the Maori language, and imitates the cry of the male kiwi during the mating season. The first European settlers to encounter the kiwi very sensibly used the Maori name, which is probably thousands of years old, rather than trying to rename the bird. The kiwi (bird) is unusual in at least two respects. First, it is the only bird in the world that has its nostrils at the end of its beak. Second, the female kiwi has the largest egg, in proportion to its body size, of any bird in the world (except possibly for the hummingbird). Kiwi are about the same size as chickens, but their eggs are almost as big as those of ostriches! It's a curious bird, the kiwi: It cannot fly, has loose, hair-like feathers and long whiskers. Kiwis grow to about the size of a chicken and weigh between three and nine pounds. They have no tail and tiny two inch wings which for all practical purposes, are useless. Despite its awkward appearance, a kiwi can actually outrun a human and have managed to survive because of their alertness and their sharp, three-toed feet, which enable them to kick and slash an enemy. The kiwi is related to the ostrich of Africa, the emu of Australia and the now-extinct moa of New Zealand. Females are larger than males and with brown kiwi, the male does most of the egg incubating. Kiwis live in pairs and mate for life, sometimes as long as 30 years. The main breeding period is from late winter to summer. Nests may be in hollow logs, under tree roots, in natural holes or in burrows excavated mainly by the male. Most clutches contain one or two eggs. Eggs are smooth, and coloured ivory or greenish-white. Kiwi eggs are proportionately larger compared to the size of the adult female than the eggs of any other bird. An egg may reach one-quarter of its mothers weight. After the first egg is laid, the male takes over incubation and nest maintenance. Incubation takes about eleven weeks but if the female returns to lay another egg, the male has to sit on the clutch for a much longer time. Leaving the nest only occasionally, the males weight can decrease by up to one third. The young kiwi emerges wearing shaggy adult plumage. The young chick is not fed by the adult, but survives on a large reserve of yolk in its belly. Gaining strength, the chick remains in the nest for six to ten days. The young kiwi then leaves the burrow, and, accompanied by the male, begins to search for food. Kiwis have been known to live up to twenty years. Surveys through the 90s show numbers throughout mainland New Zealand dropping by an alarming 5.8 per cent a year. There are now about 75,000 kiwis left. If the present rate of decline continues numbers will be down to 50,000 by the year 2006 and many of these will be on protected off-shore islands. The brown kiwi is still widespread in the central and northern North Island, but the little spotted kiwi survives only on off-shore islands. Around 1000 of them live on Kapiti Island, with transferred little spotted kiwi now well-established on Hen Island and Red Mercury Island in the Hauraki Gulf, Long Island in the Marlborough Sounds, and recently on Tiritiri Matangi in the Hauraki Gulf. Introduced predators are the biggest threat. Stoats and cats kill 95 per cent of kiwi chicks before they are six months old. Adult kiwi are often killed by ferrets and dogs and dogs and ferrets attack and kill adult kiwi. |
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