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Lord Howe Rail
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The Lord Howe Woodhen, Gallirallus sylvestris, also known as the Lord Howe Island Woodhen or Lord Howe (Island) Rail, is a flightless bird of the rail family (Rallidae). It is endemic to Lord Howe Island off the Australian coast. It is a small olive brown bird, with a short tail and a downcurved bill. The Lord Howe Island Rail lives in sub-tropical forests, feeding on earthworms, crustaceans, fruit, and taking the eggs of shearwaters and petrels. Woodhens mate for life and are usually encountered in pairs. They are territorial and will appear from the forest's understory to investigate the source of any unusual noise. A mated pair will defend an area of approximately 3 hectares, with offspring being expelled from this area once grown. The population of birds is thus restricted by the amount of available territory.[http://www.nationalparks.nsw.gov.au/npws.nsf/Content/The+Lord+Howe+Island+woodhen]
A rail, known only from a single specimen in the form of an alcohol-preserved skin at Harvard, was originally believed to have been collected on one of the Gilbert Islands and named as the Gilbert Rail, Gallirallus conditicius (Peters & Griscom, 1928). However, the island attributed to this holotype is low, rocky and sandy, and has no habitat suitable for a rail. It now appears that a curatorial error led to the specimen being labeled to the wrong collection, and the specimen is actually an immature female Lord Howe Woodhen. It differs from that species only in a paler crown, throat and underparts, and browner head, but long immersion in alcohol could have changed the colour. (Taylor and van Perlo,Rails SBN 90-74345-20-4) The island to which the specimen was originally attributed is 4,500 km from Lord Howe Island, and it appears improbable that two flightless rails could evolve separately with no morphological differences.
When explorers first discovered Lord Howe Island in 1788, they identified 15 bird species including the then common woodhen. Being flightless, curious, and having never been hunted, they became a readily available source of food for visiting sailors and the island's early human population. Since its discovery and the arrival of settlers on the island in 1834), nine of these 15 species became extinct. The woodhen declined in numbers until the late 1970s, when surveys showed that the population had dropped to less than 30 birds, confined to the difficult to access summit regions of the island's two mountains, Mount Gower and Mount Lidgbird.[http://www.nationalparks.nsw.gov.au/npws.nsf/Content/The+Lord+Howe+Island+woodhen] A comprehensive study was done to determine the cause of the decline, which was eventually attributed to the introduction of feral pigs. The elimination of the pigs and other disruptive animals (goats), plus a programme of ex-situ conservation (captive breeding) which commenced in May 1980 (the first egg was laid in June 1980), allowed the Lord Howe Rail to recover its numbers. The captive breeding program was funded with $150,000 from the Foundation for National Parks & Wildlife, which was spent to construct the compound and to employ scientists involved in this project.[http://fnpw.org.au/plants-a-wildlife/birds/lord-howe-island-woodhen] Today there are about 250 birds,[http://www.nationalparks.nsw.gov.au/npws.nsf/Content/The+Lord+Howe+Island+woodhen] which may be the optimal population size for the island. The analysis of the threats to the Lord Howe Rail, and the solution, is considered a model for conservation biology. A number of possible causes of the decline were on the island, from introduced rats to Tasmanian Masked Owls. However, only the elimination of the pigs would have saved the species from extinction, and identifying the cause and solution in a timely manner was crucial to the success of the programme. Following success with the woodhen, there have been recovery efforts for other endemic species on Lord Howe Island, including the Lord Howe Flax Snail (Placostylus bivaricosus) and the Lord Howe Currawong (Strepera graculina crissalis).