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Snow partridge
Snow Partridge from Kedarnath Wildlife Sanctuary
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Galliformes
Family:	Phasianidae
Subfamily:	Phasianinae
Genus:	Lerwa Hodgson, 1837
Species:	L. lerwa
Binomial name
Lerwa lerwa (Hodgson, 1833)
Synonyms
Lerwa nivicola Perdix lerwa protonym

The snow partridge (Lerwa lerwa) is a gamebird in the pheasant family Phasianidae found widely distributed across the high-altitude Himalayan regions of Pakistan, China, India and Nepal. It is the only species within its genus, and is thought to be the most basal member of the "erectile clade" of the subfamily Phasianinae. The species is found in alpine pastures and open hillside above the treeline but not in as bare rocky terrain as the Himalayan snowcock and is not as wary as that species. Males and females look similar in plumage but males have a spur on their tarsus.

Description

This partridge appears grey above and chestnut below with bright red bill and legs and the upperparts finely barred in black and white. In flight the pattern of dark brown primaries and secondaries with a narrow trailing white margin make them somewhat like the much larger Tibetan snowcock. The 14-feathered tail is dark and barred in white. There is variation in the shade and some birds have a nearly black crown. The primaries and secondaries are brown and the breast is deep chestnut. The abdomen has more white and the lower flanks and feathers around the vent are barred brown and white. The under-tail coverts are chestnut with black shaft streaks and white tips. Young birds have the lower parts mottled and the barring less distinct. The tarsus is feathered on the front of the leg half-way to the toes.

It measures 38–40 cm in length. Females weigh 450–580 g; males, 550–700 g. Sexes are similar in plumage, female lacks spurs on the tarsus while the male has a blunt spur and sometimes a second incipient spur. Downy chicks have a resemblance to the chicks of the blood pheasant. Chicks are born with the tarsi feathered and the nostril opening is covered by feathers.

Taxonomy and systematics

This species was first described by Brian Houghton Hodgson in 1833 and given the genus name Lerwa based on the Bhutia name for it in Nepal. Hodgson initially placed it in the genus Perdix calling it Perdix lerwa. A subspecies, L. l. major was described by Richard Meinertzhagen from Sichuan while L. l. callipygia from south Kansu was noted by Stegmann in 1938, but these are not usually recognized. The species has been retained in this monotypic genus due to various peculiarities including the tarsus feathering and the lack of clear sexual dimorphism in plumage. A species of bird louse, Chelopistes lervicola has been described as an ectoparasite of this species, and other species in this louse genus are known to parasitize the Cracidae, Meleagrididae and Odontophorinae of the New World.

Distribution and status

Snow partridge is found in the Himalayas from Pakistan to Arunachal Pradesh along the higher ranges, mainly 3000 to 5000 m (rarely below 2000 m) altitude. It is found above the tree line but not on as bare and stony terrain as the snowcocks. Although said to be found in Afghanistan, there is no evidence. The species is found over a large area is generally considered to be of low conservation concern. It is hunted to some extent, due to its habit of being more approachable than snowcock and has declined in population in some areas.

The usual habitat is alpine pastures, open grassy hillsides with grass, lichens, moss, ferns and rhododendrons. Is found among small snow-patches but not in as stony or bare ground as the snowcock. The birds however are very local in their distribution.

Behaviour and ecology

The snow partridge is found is small groups, usually about 6 to 8 but up to 30 during the non-breeding season. When flushed, they usually fly up before scattering away with noisy wing beats. The flight is rapid and stirring. It has a habit of sunning itself on rocks during the midday. The call in the breeding season is said to resemble that of the grey francolin of the plains. It has been compared in habit to that of the ptarmigan. It is said to feed on mosses, lichens, berries, and the shoots of plants. It also swallows grit to aid digestion.

The breeding season is May to July. The males are believed to be monogynous. The nest is a scrape on a hill-side under some sheltering rock, either scratched out by themselves or already available, and usually hidden with vegetation. The nest is sometimes lined with moss but well concealed although given away by the male. About 3 to 5 eggs, pale yellow in color and slightly glossy with reddish-brown markings on the rounded end, are laid, and the female incubates while the male stands sentinel. Parent birds may use distraction displays to draw the attention of predators. They call in a comparatively softer lower note to the young, which respond with chicken-like cheep calls.

Apart from Chelopistes lervicola described as an ectoparasite of this species, an Argasid tick Argas himalayensis has been noted.

References

1. BirdLife International (2016). "Lerwa lerwa". IUCN Red List of Threatened Species. 2016: e.T22678649A92783114. doi:10.2305/IUCN.UK.2016-3.RLTS.T22678649A92783114.en. Retrieved 11 November 2021.
2. Hodgson, B.H. (1833). "Description of Perdix Lerwa". Proceedings of the Zoological Society of London: 107.
3. ^ Rasmussen PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Volume 2. Smithsonian Institution & Lynx Edicions. pp. 118–119.
4. Blanford, WT (1898). Fauna of British India. Birds. Vol. 4. Taylor and Francis, London. pp. 145–146.
5. Oates, EW (1898). A manual of the Game birds of India. Part 1. A J Combridge, Bombay. pp. 196–199.
6. Jerdon, TC (1864). The Birds of India. Volume 3. George Wyman & Co, London. pp. 555–557.
7. ^ Ali, S & S D Ripley (1980). Handbook of the birds of India and Pakistan. Vol. 2 (2nd ed.). Oxford University Press. pp. 6–8. ISBN 0-19-562063-1.
8. ^ Potapov, R.L. (2000). "New information on the snow partridge Lerwa lerwa (Hodgson 1833) and its systematic position". Bulletin of the British Ornithologists' Club. 120 (2): 112–.
9. Hume, A.O. & C.H.T. Marshall (1879). The Game Birds of India, Burmah, and Ceylon. Volume 2. Calcutta, A.O. Hume and Marshall. pp. 1–7.
10. ^ Rutgers, A. (1968). Birds of Asia. Taplinger Publishing Co., Inc. p. 5. ISBN 978-0800807702.
11. Hodgson, B.H. (1833). "Characters of a new species of Perdix (P. Lerwa)". Proceedings of the Zoological Society of London: 107.
12. ^ Baker, ECS (1928). Fauna of British India. Birds. Volume 5 (2nd ed.). Taylor and Francis, London. pp. 432–435.
13. Meinertzhagen, R (1927). "Systematic Results of Birds collected at high altitudes in Ladak and Sikkim". Ibis. 69 (3): 571–633. doi:10.1111/j.1474-919X.1927.tb05372.x.
14. Marien, Daniel (1951). "Notes on some pheasants from southwestern Asia, with remarks on molt". American Museum Novitates (1518): 1–25. hdl:2246/3909.
15. Clay, T (1974). "Geographical distribution of the avian lice (Phthiraptera): a review". J. Bombay Nat. Hist. Soc. 71 (3): 536–547.
16. Jerdon, TC (1864). The Game birds and Wild fowl of India. Military Orphan Press. pp. 68–70.
17. Finn, Frank (1911). The game birds of India and Asia. Thacker, Spink & Co, Calcutta. pp. 91–92.
18. Finn, Frank (1915). Indian Sporting Birds. Francis Edwards, London. pp. 240–242.
19. Whymper, SL (1910). "Birds' nesting in Garhwal". J. Bombay Nat. Hist. Soc. 19 (4): 990–991.
20. Hume AO & CHT Marshall (1880). The Game birds of India, Burmah and Ceylon. Self published.
21. Hume, AO (1890). The nests and eggs of Indian Birds. Volume 3 (2nd ed.). R H Porter, London. p. 428.
22. Hoogstraal, H; Kaiser, MN (1973). "Observations on the Subgenus Argas (Ixodoidae: Argasidae, Argas). 7. A. (A.) himalayensis, New Species, Parasitizing the Snow Partridge, Lerwa lerwa, in Nepal". Annals of the Entomological Society of America. 66 (1): 1–3. doi:10.1093/aesa/66.1.1.
23. Clay, Theresa (1941). "A new genus and species of Mallophaga" (PDF). Parasitology. 33: 119–129. doi:10.1017/S0031182000024318. S2CID 84303624.

External links

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v t e Genera of landfowl and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Superorder: Galloanserae Clade: Pangalliformes
Pangalliformes incertae sedis †Anisolornis? †Archaeophasianus? †Argillipes? †Austinornis? †Chambiortyx †Coturnipes? †"Gigantibis"? †Litoripes? †Percolinus? †Tegulavis? †Gallinuloididae Gallinuloides Paraortygoides †Paraortygidae Paraortyx Pirortyx Scopelortyx Xorazmortyx †Quercymegapodiidae Ameripodius Quercymegapodius Taubacrex †Sylviornithidae Megavitiornis Sylviornis Galliformes See below ↓
Galliformes Galliformes †Amitabha †Bumbanipodius †Bumbanortyx †Linquornis †Namaortyx †Palaeoalectoris †Procrax †Sobniogallus †Taoperdix Megapodiidae †Garrdimalga? †Mwalau †Ngawupodius Alecturini Aepypodius Alectura †Latagallina Leipoa †Progura Talegalla Megapodiini Eulipoa Macrocephalon Megapodius Cracidae †Archaealectrornis †Boreortalis †Palaeonossax †Procrax Penelopinae Aburria Chamaepetes Penelope Penelopina Pipile Cracinae Oreophasis Ortalis Cracini Crax Mitu Nothocrax Pauxi Phasianoidea See below ↓
Phasianoidea Numididae Acryllium Agelastes Guttera Numida †Telecrex Odontophoridae †Miortyx †Nanortyx †Neortyx Ptilopachinae Ptilopachus Odontophorinae Callipepla Colinus Cyrtonyx Dactylortyx Dendrortyx Odontophorus Oreortyx Philortyx Rhynchortyx Phasianidae See below ↓
Phasianidae Phasianidae †Bantamyx †Centuriavis †Diangallus †Eurobambusicola †Lophogallus †Megalocoturnix †Miogallus †Mioryaba †Palaeocryptonyx †Palaeortyx †Panraogallus †Pliogallus †Plioperdix †Rustaviornis †Schaubortyx †Shandongornis †Shanxiornis †Titanoperdix †Tologuica Rollulinae Arborophila Caloperdix Melanoperdix Rhizothera Rollulus Xenoperdix Pavoninae Tropicoperdix Coturnicini Alectoris Ammoperdix Coturnix Margaroperdix †?Ophrysia Perdicula Pternistis Synoicus Tetraogallus Gallini Bambusicola Campocolinus Francolinus Gallus Ortygornis Peliperdix Scleroptila Pavonini Afropavo Argusianus Pavo Rheinardia Polyplectronini Galloperdix Haematortyx Polyplectron Phasianinae †Chauvireria Ithaginis Lerwa Lophophorini Lophophorus Tetraophasis Tragopan Phasianini Catreus Chrysolophus Crossoptilon Lophura Perdix Phasianus Syrmaticus Tetraonini Bonasa Canachites Centrocercus Dendragapus Falcipennis Lagopus Lyrurus Meleagris †Palaealectoris †Proagriocharis Pucrasia †Rhegminornis Tetrao Tetrastes Tympanuchus

• IUCN Red List least concern species
• Phasianinae
• Partridges
• Birds of Afghanistan
• Birds of the Himalayas
• Birds of North India
• Birds of Central China
• Birds of Tibet
• Birds described in 1833
• Taxa named by Brian Houghton Hodgson