In Thai: นกอีล้ำ, nok e-lum
Binomial name: Gallinula chloropus, Carolus Linnaeus, 1758
The common moorhen (Gallinula chloropus), also known as the waterhen or swamp chicken, is a bird species in the rail family (Rallidae). It is distributed across many parts of the Old World.
The common moorhen lives around well-vegetated marshes, ponds, canals and other wetlands. The species is not found in the polar regions or many tropical rainforests. Elsewhere it is likely the most common rail species, except for the Eurasian coot in some regions.
The closely related common gallinule of the New World has been recognized as a separate species by most authorities, starting with the American Ornithologists' Union and the International Ornithological Committee in 2011.
The name mor-hen has been recorded in English since the 13th century. The word moor here is an old sense meaning marsh; the species is not usually found in moorland. An older name, common waterhen, is more descriptive of the bird's habitat.
A "watercock" is not a male "waterhen" but the rail species Gallicrex cinerea, not closely related to the common moorhen. "Water rail" usually refers to Rallus aquaticus, again not closely related.
The scientific name Gallinula chloropus comes from the Latin Gallinula (a small hen or chicken) and the Greek chloropus (khloros green or yellow, pous foot).
The moorhen is a distinctive species, with dark plumage apart from the white undertail, yellow legs and a red frontal shield. The young are browner and lack the red shield. The frontal shield of the adult has a rounded top and fairly parallel sides; the tailward margin of the red unfeathered area is a smooth waving line. In the related common gallinule of the Americas, the frontal shield has a fairly straight top and is less wide towards the bill, giving a marked indentation to the back margin of the red area.
The common moorhen gives a wide range of gargling calls and will emit loud hisses when threatened. A midsized to large rail, it can range from 30 to 38 cm in length and span 50 to 62 cm across the wings. The body mass of this species can range from 192 to 500 g.
This is a common breeding bird in marsh environments, well-vegetated lakes and even in city parks. Populations in areas where the waters freeze, such as eastern Europe, will migrate to more temperate climates. In China, common moorhen populations are largely resident south of the Yangtze River, whilst northern populations migrate in the winter, therefore these populations show high genetic diversity.
Diet and feeding
This species will consume a wide variety of vegetable material and small aquatic creatures. They forage beside or in the water, sometimes walking on lilypads or upending in the water to feed. They are often secretive, but can become tame in some areas. Despite loss of habitat in parts of its range, the common moorhen remains plentiful and widespread.
The birds are territorial during breeding season. The nest is a basket built on the ground in dense vegetation. Laying starts in spring, between mid-March and mid-May in Northern hemisphere temperate regions. About 8 eggs are usually laid per female early in the season; a brood later in the year usually has only 5–8 or fewer eggs. Nests may be re-used by different females. Incubation lasts about three weeks. Both parents incubate and feed the young. These fledge after 40–50 days, become independent usually a few weeks thereafter, and may raise their first brood the next spring. When threatened, the young may cling to the parents' body, after which the adult birds fly away to safety, carrying their offspring with them.
Status and population
On a global scale – all subspecies taken together – the common moorhen is as abundant as its vernacular name implies. It is therefore considered a species of Least Concern by the IUCN. However, small populations may be prone to extinction. The population of Palau, belonging to the widespread subspecies G. c. orientalis and locally known as debar (a generic term also used for ducks and meaning roughly "waterfowl"), is very rare, and apparently the birds are hunted by locals. Most of the population on the archipelago occurs on Angaur and Peleliu, while the species is probably already gone from Koror. In the Lake Ngardok wetlands of Babeldaob, a few dozen still occur, but the total number of common moorhens on Palau is about in the same region as the Guam population: fewer than 100 adult birds (usually fewer than 50) have been encountered in any survey.
The common moorhen is one of the birds (the other is the Eurasian coot, Fulica atra) from which the cyclocoelid flatworm parasite Cyclocoelum mutabile was first described. The bird is also parasitised by the moorhen flea, Dasypsyllus gallinulae.
Five subspecies are today considered valid; several more have been described that are now considered junior synonyms. Most are not very readily recognizable, as differences are rather subtle and often clinal. Usually, the location of a sighting is the most reliable indication as to subspecies identification, but the migratory tendencies of this species make identifications based on location not completely reliable. In addition to the extant subspecies listed below, an undescribed form from the Early Pleistocene is recorded from Dursunlu in Turkey.
|List of subspecies by date of description|
|Common and, trinomial names||Description||Range|
|Eurasian common moorhen, G. c. chloropus (Linnaeus, 1758), Includes correiana and indica.||Wings and back blackish-olive||Ranges from Northwest Europe to North Africa and eastwards to Central Siberia and from the humid regions of the Indian Subcontinent and Southeast Asia eastwards to Japan; also found the Canary, Azores, Madeira, and Cape Verde islands.|
|Indo-Pacific common moorhen, G. c. orientalis (Horsfield, 1821)||Small, with slate grey upperwing coverts and large frontal shield.||Found in the Seychelles, Andaman Islands, and South Malaysia through Indonesia; also found in the Philippines and Palau. The breeding population existing on Yap in Micronesia since the 1980s is probably of this subspecies, but might be of the rare G. c. guami., Population size: Perhaps a few 100s on Palau as of the early 2000s, less than 100 on Yap as of the early 2000s.|
|African common moorhen, G. c. meridionalis (C. L. Brehm, 1831)||Similar to orientalis, but the frontal shield is smaller.||Found in Sub-Saharan Africa and Saint Helena.|
|Madagascan common moorhen, G. c. pyrrhorrhoa (A. Newton, 1861)||Similar to meridionalis, but the undertail coverts are buff.||Found on the islands of Madagascar, Réunion, Mauritius, and the Comoros.|
|Mariana common moorhen, G. c. guami (Hartert, 1917), Called pulattat in Chamorro.||Body plumage is very dark.||Endemic to the Northern Mariana Islands, but see also G. c. orientalis above., Population size: About 300 as of 2001.|
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- Gallinula chloropus
- Thai: นกอีล้ำ, nok e-lum
Gallinula chloropus chloropus, Carolus Linnaeus, 1758
Common name: Eurasian common moorhen
Range: Includes correiana and indica. Wings and back blackish-olive. Ranges from Northwest Europe to North Africa and eastwards to Central Siberia and from the humid regions of the Indian Subcontinent and Southeast Asia eastwards to Japan; also found the Canary, Azores, Madeira, and Cape Verde islands.
Gallinula chloropus guami, Ernst Johann Otto Hartert, 1917
Common name: Mariana common moorhen
Range: Called pulattat in Chamorro. Body plumage is very dark. Endemic to the Northern Mariana Islands, but see also G. c. orientalis above., Population size: About 300 as of 2001.
Gallinula chloropus meridionalis, Christian Ludwig Brehm, 1831
Common name: African common moorhen
Range: Similar to orientalis, but the frontal shield is smaller. Found in Sub-Saharan Africa and Saint Helena.
Gallinula chloropus orientalis, Thomas Horsfield, 1821
Common name: Indo-Pacific common moorhen
Range: Small, with slate grey upperwing coverts and large frontal shield. Found in the Seychelles, Andaman Islands, and South Malaysia through Indonesia; also found in the Philippines and Palau. The breeding population existing on Yap in Micronesia since the 1980s is probably of this subspecies, but might be of the rare G. c. guami., Population size: Perhaps a few 100s on Palau as of the early 2000s, less than 100 on Yap as of the early 2000s.
Gallinula chloropus pyrrhorrhoa, Alfred Newton, 1861
Common name: Madagascan common moorhen
Range: Similar to meridionalis, but the undertail coverts are buff. Found on the islands of Madagascar, Réunion, Mauritius, and the Comoros.
- Fulica chloropus, Carolus Linnaeus (1758)
Least Concern (IUCN3.1)