New zealand its long isolation from the rest of the world and its island biogeography, this land has extraordinary flora and fauna, descended from Gondwanan wildlife or since arriving by flying, swimming or being carried across the sea. About 80% of New Zealand's flora is endemic, including 65 endemic genera.The two main types of forest are those dominated by podocarps and/or the giant kauri, and in cooler climates the southern beech. The remaining vegetation types in New Zealand are grasslands of tussock and other grasses, usually in sub-alpine areas, and the low shrublands between grasslands and forests.New Zealand's forests were inhabited by a diverse range of megafauna, including the flightless moas (now extinct), four species of kiwi, the kakapo and the takahē, all endangered by human actions. Unique birds capable of flight included the Haast's eagle, which was the world's largest bird of prey (now extinct), and the large kaka and kea parrots. Reptiles present in New Zealand include skinks, geckos and living fossil tuatara. There are four endemic species of primitive frogs. There are no snakes and there is only one venomous spider, the katipo, which is rare and restricted to coastal regions. However, there are many endemic species of insects, including the weta, one species of which may grow as large as a house mouse and is the heaviest insect in the world.
New Zealand has suffered a high rate of extinctions, including the moa species, the huia, laughing owl and flightless wrens (which formerly occupied the roles elsewhere occupied by mice). This is due to human activities such as hunting and pressure from introduced feral animals, such as weasels, stoats, cats, goats, deer and brushtailed possums. Five indigenous vascular plant species are now believed to be extinct, including A
dam's mistletoe and a species of forget-me-not.The New Zealand has led the world in island restoration projects where offshore islands are cleared of introduced mammalian pests and native species are reintroduced. Several islands located near to the three main islands are wildlife reserves where common pests such as possums and rodents have been eradicated to allow the reintroduction of endangered species to the islands. A more recent development is the mainland ecological island.
