It is apparently most closely related to the Okinawa rail (Gallirallus okinawae) from the Ryukyu islands, Japan.    From Wordnik.com.  [Biological diversity in the Philippines] Reference

Weka Gallirallus australis scotti were introduced from New Zealand in the mid 1800s as a source of food for the sealers.    From Wordnik.com.  [MacQuarie Island, Australia] Reference

The Okinawa rail (Gallirallus okinawae, EN) is represented by a single population in the Yambaro Forest on northern Okinawa.    From Wordnik.com.  [Biological diversity in Japan] Reference

In May 2004, a possibly new species of rail Gallirallus was observed on Calayan island in the Babuyan islands, northern Philippines.    From Wordnik.com.  [Biological diversity in the Philippines] Reference

C.a. iredalei was endemic to Stewart Island, but died out when weka (Gallirallus australis) and rats (Rattus rattus) were introduced.    From Wordnik.com.  [Rakiura Island temperate forests] Reference

Two bird species extinctions have already occurred on Guam in the 1980s, and the endemic Guam rail (Gallirallus owstoni) is extinct in the wild.    From Wordnik.com.  [Marianas tropical dry forests] Reference

One is the now extinct Wake Island rail (Gallirallus wakensis), which was last seen in 1945 and is presumed to have been eaten by the occupying Japanese forces.    From Wordnik.com.  [Eastern Micronesia tropical moist forests] Reference

Other birds with no close relatives beyond New Zealand found in the area include: blue duck Hymenolaimus malacorhynchos, wrybill Anarhynchus frontalis and western weka Gallirallus australis.    From Wordnik.com.  [Te Wahipounamu (South-West New Zealand World Heritage Area), New Zealand] Reference

Ashore, penguins are prey to a variety of species, such as leopards in South Africa, and Weka (Gallirallus australis) in New Zealand, whilst introduced species such as stoats, rats and feral cats will feed on nesting birds.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

Another of the hotspot’s well-known endemic birds is the Okinawa rail (Gallirallus okinawae, EN), which is also confined to Yanbaru.    From Wordnik.com.  [Biological diversity in Japan] Reference

The following species and subspecies were eliminated after European settlement: the Chatham Island bellbird (Anthornis melanura melanocephala), Chatham Island fernbird (Megalurus rufescens), Diffenbach’s rail (Gallirallus dieffenbachii), Chatham Island rail (Gallirallus modestus), brown teal (Anas aucklandica), bittern (Botaurus poiciloptilus), New Zealand falcon (Falco novaeseelandiae), and New Zealand shoveler (Anas rhynchotis variegata).    From Wordnik.com.  [Chatham Island temperate forests] Reference