The Great Oahu Crake or Great Oahu Rail (Porzana ralphorum) is an extinct bird species endemic to the island of Oahu

Oahu

Oahu or Oahu , known as "The Gathering Place", is the third largest of the Hawaiian Islands and most populous of the islands in the U.S. state of Hawaii. The state capital Honolulu is located on the southeast coast...

 in Hawaii

Hawaii

Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...

. It was one of two flightless rails

Rallidae

The rails, or Rallidae, are a large cosmopolitan family of small to medium-sized birds. The family exhibits considerable diversity and the family also includes the crakes, coots, and gallinules...

 that had survived on the island until the arrival of people in 200 C.E.

It was the larger of two species of rail found on the island of Oahu. There were several specimens of this bird found in early settlements. It was 1.5 foot (0.4572 m) tall, had a 1 inches (2.5 cm), and a neck 9 inches (22.9 cm) long. Its wings were on average less than 3 inches (7.6 cm) long, making it flightless. The Great Oahu Crake was probably a brown, grey, and black bird like its recently extinct relatives the Hawaiian

Hawaiian Rail

The Hawaiian Rail , Hawaiian Spotted Rail, or Hawaiian Crake was a somewhat enigmatic species of diminutive rail that lived on Big Island of Hawaii, but is now extinct. It was a flightless bird that was apparently found in shrubland and secondary growth on abandoned fields and in times of danger...

 and Laysan Rail

Laysan Rail

The Laysan Rail or Laysan Crake was a tiny inhabitant of the Northwest Hawaiian Island of Laysan. This small island was and still is an important seabird colony, and sustained a number of endemic species, including the rail. It became extinct due to habitat loss by domestic rabbits, and ultimately...

s.

It probably feed on the fruit

Fruit

In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...

s, leaves, and flower

Flower

A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s of trees that fell onto the ground.

The cause of extinction is not very well known, but we can speculate that it was hunted for meat, and its bones and feathers were used in old style art. It may have also have been attacked by Polynesian Rat

Polynesian Rat

The Polynesian Rat, or Pacific Rat , known to the Māori as kiore, is the third most widespread species of rat in the world behind the Brown Rat and Black Rat. The Polynesian Rat originates in Southeast Asia but, like its cousins, has become well travelled – infiltrating Fiji and most Polynesian...

s that were brought by the natives by accident.