The Orokonui Ecosanctuary has become the only place on mainland South Island of New Zealand where native birds, animals and insects can live a life safe from predators. An 8.7km pest-proof fence was completed in 2007 that encompasses 307 hectares of native and introduced forest. Animal pests have been almost entirely eradicated to allow reintroductions of endangered native species such as tuatara, kiwi and takahe. Futhermore it is becoming increasingly common for native birds to find their own way into the ecosanctuary and take up residence.