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sarus crane

 
Dictionary: sa·rus crane   (sär'əs) pronunciation
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n.
A large crane (Grus antigone) of southern Asia, having a partly red head and neck.

[Hindi sāras, from Sanskrit sārasaḥ, from sārasa-, of lakes, from saraḥ, saras-, lake.]


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Animal Encyclopedia: Sarus crane
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Grus antigone

SUBFAMILY

Gruinae

TAXONOMY

Ardea antigone Linnaeus, 1758, India. Three subspecies.

OTHER COMMON NAMES

English: Sharpe's crane; French: Grue antigone; German: Saruskranich; Spanish: Grulla Sarus.

PHYSICAL CHARACTERISTICS

Height up to 69 in (176 cm); wingspan 86.6–110.2 in (220–280 cm); weight 11–26.5 lb (5–12 kg). Gray body, red skin on head, throat, and upper neck.

DISTRIBUTION

Northern and central India, southeastern Pakistan, southern Myanmar, Cambodia, southern Laos, Vietnam, and northern Australia.

HABITAT

Wetlands, including seasonally flooded savannas and human-made areas such as canals, irrigation ditches, and fields.

BEHAVIOR

Subspecies in India and Australia is generally nonmigratory, but population in southeast Asia is locally migratory.

FEEDING ECOLOGY AND DIET

A generalist, its diet includes plants, grains, insects, fish, and other small vertebrates.

REPRODUCTIVE BIOLOGY

Lays 2 or 3 eggs, incubated for 31–34 days. Chicks fledge at 85–100 days.

CONSERVATION STATUS

Endangered, and listed on CITES Appendix II.

SIGNIFICANCE TO HUMANS

Regarded as omens for good crops in India.

Wikipedia: Sarus Crane
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Sarus Crane
Grus antigone antigone
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Gruiformes
Family: Gruidae
Genus: Grus
Species: G. antigone
Binomial name
Grus antigone
(Linnaeus, 1758)
Subspecies
  • G. a. antigone (Linnaeus, 1758)
    (Indian Sarus Crane)
  • G. a. sharpii (=sharpei) Blanford, 1895[2]
    (Indochina or Burmese Sarus Crane, Sharpe's Crane, Red Headed Crane)
  • G. a. gilliae (=gillae) Schodde, 1988
    (Australian Sarus Crane)
  • G. a. luzonica Hachisuka, 1941
    (Luzon Sarus Crane - extinct)
Synonyms

Ardea antigone Linnaeus, 1758
Grus sharpei
Megalornis antigone

The Sarus Crane (Grus antigone) is a large non-migratory crane found in parts of the Indian Subcontinent, Southeast Asia and Australia. The tallest flying birds, standing at a height of up to 1.8 m (5.9 ft),[3] they are conspicuous and iconic[4] species of open wetlands. The Sarus Crane is easily distinguished from other cranes in the region by the overall grey colour and the contrasting red head and upper neck. They forage on marshes and shallow wetlands where they feed on roots, tubers, insects, crustaceans and small vertebrate prey. They form long-lasting pair-bonds and maintain territories within which they often display with loud trumpeting and leaping. They are widely believed to mate for life, pining for their mates and are considered as symbols of marital fidelity. They breed mainly during the rainy season, building a large raised circular platform nest made of reeds and grasses that is surrounded by water. Their numbers have declined greatly in the last century and it has been estimated that the current population is a tenth or less (perhaps 2.5%) of the numbers that existed in the 1850s. The stronghold of the species is India, where it is traditionally revered and lives in agricultural lands in close proximity to humans. Elsewhere, the species has been extirpated in many parts of its former range.

Contents

Description

In flight the black primaries contrast with the grey (Bharatpur, India)

The adult Sarus Crane is very large with grey wings and body; a bare red head and part of the upper neck; a greyish crown; and a long greenish-grey pointed bill. In flight, the long neck is held straight, unlike a that of an heron, which folds it back, and the black wing tips can be seen; the crane's long pink legs trail behind them. This bird has a grey ear covert patch, an orange-red iris and a greenish-grey bill. Juveniles have a yellowish base to the bill and the brown-grey head is fully feathered.[5]

The red skin of the adult's bare head and neck is brighter during the breeding season. This skin is rough and covered by papillae, and a narrow area around and behind the head is covered by black bristly feathers. The sexes do not differ in plumage although males are on average larger than females; male Sarus of the Indian population can attain a maximum height of approximately 200 cm (6.6 ft), with a wingspan of 250 cm (8.5 ft), making them the world's tallest extant flying bird. The average weight of nominate race individuals is 6.8-7.8 kg, (15 lb), while five adult sharpii averaged 8.4 kg. Across the distribution range, the weight can vary from 5 to 12 kg (11-26 lbs), height typically from 115 to 167 cm (45–69 in) and the wingspan from 220 to 280 cm (87–110 in).[6] Birds from Australia tend to be smaller than birds from the north.[7]

In Australia, the Sarus can easily be mistaken for the more widespread Brolga. The Brolga has the red colouring confined to the head and not extending into the neck.[6]

Distribution and habitat

The species has historically been widely distributed on the lowlands of India along the Gangetic plains, extending south to the Godavari River, west to coastal Gujarat, and east to West Bengal and Assam[8]. The species no longer breeds in the Punjab, though it occurs sporadically in the Indian side in winter.[8] Sarus Cranes are rare and occur in very low numbers in West Bengal and Assam,[9] and are no longer found in the state of Bihar.[8] In Nepal, its distribution is restricted to the western lowland plains, with most of the population occuring in Rupandehi, Kapilvastu, and Nawalparasi districts.[10]

There are two distinct populations of Sarus Cranes in South-east Asia: the northern population in China and Burma, and the southern population in Cambodia and Vietnam.[11] The Sarus used to extend to Thailand and further east into the Philippines, but is extinct in both areas now. In Australia they are found only in the northern parts, and are partly migratory in some areas.[12] The global range has reduced and the largest occupied area is now in India. With marshlands largely destroyed, these cranes are increasingly dependent on wet paddy fields in India. Although now found mainly at a low elevation on the plains, there are some historic records from highland marshes further north in Harkit Sar and Kahag in Kashmir.[13] The Sarus Crane breeds in some high elevation regions such as near the Pong Dam in Himachal Pradesh where populations may be growing in response to increasing rice cultivation along the reservoir.[8][10]

Sarus Cranes preferentially use wetlands[14] or non-cultivated patches amid wet flooded rice paddies (khet-taavadi[15]) as nest sites. Breeding pairs are territorial and prefer to forage in natural wetlands, though wet crops like rice and wheat are also used to a large extent.[8][10][16]

Taxonomy and systematics

All cranes have a raised and much reduced hind toe

This species was described by Linnaeus under the genus Ardea along with the larger herons. Edward Blyth believed that there were actually two "Sarus Crane" species in India, Grus collaris and Grus antigone.[17] Most modern authors recognize one species with three subspecies although the status of one extinct population from the Philippines is uncertain. The nominate subspecies from India is the largest, and in the east from Myanmar is replaced by race sharpii that extending into the Southeast Asian islands. The nominate form from the Indian subcontinent is well marked and differentiated by having a white collar below the bare head and upper neck, and white tertiary remiges. Some authors consider antigone and sharpii as representatives of a formerly continuous population that varied clinally.[7] The race in Australia, initially placed in sharpii (sometimes spelt sharpei but amended to conform to the rules of Latin grammar[5]) has been separated and named as the race gilliae (sometimes spelt gillae or even gilli). The Australian race was designated only in 1988 with the species itself first noticed in Australia by ornithologists in 1969 and regarded as a recent immigrant. Native Australians however differentiated the Sarus and the Brolga and called the Sarus as "the crane that dips its head in blood". The Australian race has a distinctively darker plumage and large grey patch of ear coverts.[note 1] This race is the most recently diverged with an estimated 3000 generations of breeding within Australia.[3] An additional subspecies luzonica has been suggested for the race once found, but now extinct, in the Philippines. It may be synonymous with either gilliae or sharpii.[18]

Displaying (Hodal, India)

Analysis of mtDNA, using a limited number of specimens, suggested that there was gene flow within the continental Asian populations until the 20th century reductions in range, and that Australia was colonized only in the Late Pleistocene, some 35000 years ago.[3] This has been corroborated by nDNA microsatellite analyses with 4 times the sample size.[7] This study further suggests that the Australian population is quite inbred. As there exists the possibility of (limited) hybridization with the genetically quite distinct Brolga, the Australian Sarus Crane can be expected to be an incipient species.[7]

Etymology

The common name of sarus is from the Hindi name ("sāras") for the species. The Hindi word is derived from the Sanskrit word sarasa for the "lake bird", (sometimes corrupted to sārhans). While Indians held the species in veneration, British soldiers in colonial India hunted the bird, calling it the serious[19] or even cyrus.[20] The species name of antigone, after the daughter of Oedipus, who hanged herself may relate to the bare skin of the head and neck.[6][note 2]

Ecology and behaviour

Unlike many other cranes that make long migrations, the Sarus Crane is largely non-migratory; it may however make short-distance movements in response to rain or dry weather conditions. The only migratory population is in South-east Asia.[11] Breeding pairs maintain territories that are defended from other cranes using a large repertoire of calls and displays. Non-breeding birds occur as flocks of various sizes that vary from 1-430 birds.[8][21] In semi-arid areas, breeding pairs and successfully fledged juveniles depart from territories in the dry season and join non-breeding flocks. In areas with perennial water supply, like in the western plains of Uttar Pradesh, breeding pairs maintain perennial territories. The largest known flocks are from the 29 km2 Keoladeo National Park[22] - as many as 430 birds, and from wetlands in Etawah and Mainpuri districts in Uttar Pradesh - ranging from 245-412 birds. Flocks of over 100 birds are also regularly reported from Gujarat[23] and Australia. During the breeding season, breeding pairs oust non-breeding birds from some wetland sites, and local populations can appear to decline. For example, Sarus Crane populations in Keoladeo National Park reduced from over 400 birds in the summer to 20 birds during the monsoon.[22]

They roost in shallow water, where they may be safe from some ground predators.[6] Adult birds do not moult their feathers annually and replace them only once every two or three years.[24]

Feeding

Foraging in marshland (Bharatpur)

Flocks are rarer than breeding birds, and Sarus Cranes are usually seen in pairs or small family groups of two to four individuals when they forage in shallow water (usually with less than 30 cm (1 ft) depth of water) or in fields, frequently probing in mud with their long bills. They are omnivorous, eating insects (especially grasshoppers), aquatic plants, fish (perhaps only in captivity[25]), frogs, crustaceans and seeds. They may occasionally tackle larger vertebrate prey such as water snakes (Xenochrophis piscator)[6] and Sarus Cranes may sometimes feed on the eggs of birds[26] and turtles.[27] Plant matter eaten includes tubers, corms of aquatic plants and grass shoots. They may also feed on cultivated crops such as groundnuts and cereal crops such as rice.[6]

Courtship and breeding

The long coiled trachea that produce the trumpeting calls

Sarus Cranes have loud trumpeting calls. These calls are, as in other cranes, produced by the elongated trachea that form coils within the sternal region.[28] Pairs may indulge in spectacular displays of calling in unison and posturing. These include "dancing" movements that are performed both during and outside the breeding season and involve a short series of jumping and bowing movements made as the pair circle each other.[29] Dancing may also be a displacement activity when the nest or young are threatened.[6] The cranes breed mainly during the monsoons in India (from July to October although there may be a second brood,[22] and there are records of breeding in all the months[8] and with the onset of the wet season in Australia. They build large nests, platforms made of reeds and vegetation in wet marshes or paddy fields.[15] The nest is constructed using rushes and straw along with grasses, their roots and mud. The nest is usually surrounded by shallow water and is unconcealed, with the bird at nest being visible from afar.[30] The platform nests can be more than two metres (six feet) in diameter and nearly a metre (three feet) high.[31] Pairs shows high fidelity to the nest site, often reusing nests over as many as five years.[32] The clutch is one or two eggs (rarely three[33] or four[34] which are incubated by both sexes[35] for about 31 days (range 27–35 days[8][36]). Eggs are chalky white and weigh about 240 grams.[6] The eggshells are removed by the parents after the chicks hatch either by carrying away the fragments or by swallowing them.[37] Chicks stay along with their parents for a long duration of more than three months.[6] The Sarus is widely believed to pair for life, however cases of "divorce" and mate replacement have been recorded.[38]

Mortality factors

Eggs are often destroyed at the nest by Jungle and House Crows.[37] In Australia, predators of young birds include the dingo (Canis dingo) and fox (Vulpes vulpes) while Brahminy Kites have been known to take eggs.[6] Removal of eggs by farmers (to reduce crop damage) or children (in play)[39], or by migrant labourers for food[40] is the prominent cause of egg mortality. 31-42% of nests with eggs can fail to hatch eggs for this reason. Chicks are also prone to predation (estimated at about 8%) but more than 30% die of unknown reasons.[41][42] Breeding success has been estimated at about 20%.[43] In areas where farmers are tolerant, nests in flooded rice fields and those in wetlands have similar rates of survival.[39] Breeding Sarus Crane pairs that nest later in the season have lower chances of raising chicks successfully, but this improves when territories have more wetlands.[39]

Little is known about diseases, parasites and their effects in the wild. A study at Rome zoo noted that these birds were resistant to anthrax.[44] A trematode, Opisthorhis dendriticus, was described from the liver of a crane at the London zoo[45] and a Cyclocoelid (Allopyge antigones) described from Australia.[46] Like most birds they have bird lice and the species recorded include Heleonomus laveryi and Esthiopterum indicum.[47]

Cranes in captivity have been known to live for as long as 42 years.[note 3][48][49] Premature adult mortality is often the result of human actions. Accidental poisoning by monocrotophos- and dieldrin-treated seeds used in agricultural areas has been noted.[50][51] Adults have been known to fly into power lines and die of electrocution, this is responsible for killing c. 1% of the local population each year.[52]

Conservation status

These cranes are usually seen in pairs or small groups (Sultanpur National Park)

There were about an estimated 15-20,000 mature Sarus Cranes left in the wild in 2009.[1] The Indian population is less than 10,000 birds but is the healthiest in terms of numbers. They are considered sacred and the birds are traditionally left unharmed,[53] and in many areas they are unafraid of humans. They used to be found on occasion in Pakistan, but have not been seen there since the late 1980s. The population in India has however declined.[1] Estimates of the global population suggest that the population in 2000 was at best about 10% and at the worst just 2.5% of the numbers that existed in 1850.[54] Many farmers in India believe that these cranes damage standing crops,[10] particularly rice, although studies show that direct feeding on rice grains resulted in losses amounting to less than 1 percent and trampling could account for grain loss of about 0.4-15 kilograms.[55] The attitude of farmers tends to be positive in spite of these damages and this has helped in conserving the species within agricultural areas. Compensating farmers for crop losses has been suggested as a measure that may help.[41] The role of rice paddies may be particularly important for their conservation as natural wetlands are increasingly threatened by human activity.[56] The Australian population is greater than 5,000 birds and may be increasing,[7] however, the Southeast Asian subspecies has been decimated by war and habitat change (such as intensive agriculture and draining of wetlands) and by the mid-20th century had disappeared from large parts of its range which once stretched up to southern China; some 1500–2000 birds are left in several fragmented subpopulations. The little-known Philippine population became extinct in the late 1960s.[1]

A family group of two adults and a juvenile

As a species, the Sarus Crane is classified as Vulnerable (A2cde + 3cde). Threats include habitat destruction and/or degradation, hunting and collecting, as well as environmental pollution and possibly diseases or competing species. Inbreeding effects in the Australian population may need to be studied.[7]

The species has been extirpated in Malaysia, Philippines and Thailand. Reintroduction programs planned in Thailand have made use of birds from Cambodia.[57]

In culture

The species is venerated in India and legend has it that Valmiki cursed a hunter for killing a Sarus Crane and was then inspired to write the epic Ramayana.[58][59] The species was a close contender to the Indian Peafowl as the national bird of India.[60] Among the Gonds, the tribes classified as "five-god worshippers" consider the Sarus Crane as sacred.[61] The meat of the Sarus was taboo.[62] It is widely believed that the Sarus pairs for life and that death of one partner leads to the other pining to death. They are a symbol of marital virtue and in parts of Gujarat, it is a custom to take a newly wed couple to see a pair of Sarus Cranes.[63] Being ubiquitous in the flood plains of the Ganges, observations on their biology had been made by the Mughal emperor, Jahangir around AD 1607. He noted, for instance, that the species always laid two eggs with an interval of 48 hours between them and that the incubation period was 34 days.[6]

Although venerated and protected by Indians, these birds were hunted during the colonial period although sportsmen were discouraged from hunting them.[64] According to Jerdon, young birds were said to be good eating while older ones were said to be "worthless for the table".[65] Eggs of the Sarus Crane are however used in folk remedies in some parts of India.[63][66]

Young birds were kept in menageries in former times:

... The young birds are easily reared by hand, and become very tame and attached to the person who feeds them, following him like a dog. They are very amusing birds, going through the most grotesque dances and antics, and are well worth keeping in captivity. One which I kept, when bread and milk was given to him, would take the bread out of the milk, and wash it in his pan of water before eating it. This bird, which was taken out of the King's palace at Lucknow, was very fierce towards strangers and dogs, especially if they were afraid of him. He was very noisy—the only bad habit he possessed.
—Irby, 1861[67]

An Indian aircraft, the Saras, is named after this crane.[68]

Notes

  1. ^ Meine & Archibald (1996) p. 126
  2. ^ Johnsgard (1983) p. 239
  3. ^ Flower (1938) notes only 26 years in captivity

References

  1. ^ a b c d BirdLife International (2009). "Species factsheet: Grus antigone". http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=2787&m=0. Retrieved 2009-05-23. 
  2. ^ Blanford, W.T (1896). "A note on the two sarus cranes of the Indian region". Ibis 2: 135–136. 
  3. ^ a b c Wood, T.C. & Krajewsky, C. (1996). "Mitochondrial DNA sequence variation among the subspecies of Sarus Crane (Grus antigone)" (PDF). The Auk 113 (3): 655–663. http://elibrary.unm.edu/sora/Auk/v113n03/p0655-p0663.pdf. 
  4. ^ Vyas, Rakesh (2002). "Status of Sarus Crane Grus antigone antigone in Rajasthan and its ecological requirements". Zoos' Print Journal 17 (2): 691–695. http://www.zoosprint.org/ZooPrintJournal/2002/February/691-695.pdf. 
  5. ^ a b Rasmussen, PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Volume 2. Smithsonian Institution and Lynx Edicions. pp. 138–139. 
  6. ^ a b c d e f g h i j k Johnsgard, Paul A. (1983). Cranes of the world. Indiana University Press, Bloomington. ISBN 0253112559. http://digitalcommons.unl.edu/bioscicranes/4/. 
  7. ^ a b c d e f Jones, Kenneth L.; Barzen, Jeb A. & Ashley, Mary V. (2005). "Geographical partitioning of microsatellite variation in the sarus crane". Animal Conservation 8 (1): 1–8. doi:10.1017/S1367943004001842. 
  8. ^ a b c d e f g h Sundar, KSG; Choudhury, BC (2003). "The Indian Sarus Crane Grus a. antigone: a literature review.". J. Ecol. Soc. 16: 16–41. 
  9. ^ Choudhury, A. (1998). "Mammals, birds and reptiles of Dibru-Saikhowa Sanctuary, Assam, India.". Oryx 32 (3): 192–200. doi:10.1017/S0030605300029951. 
  10. ^ a b c d Sundar, KSG; Kaur, J; Choudhury, BC (2000). "Distribution, demography and conservation status of the Indian Sarus Crane (Grus antigone antigone) in India.". J. Bombay Nat. Hist. Soc. 97 (3): 319–339. 
  11. ^ a b Archibald, G.W.; Sundar, KSG; Barzen, J. (2003). "A review of the three subspecies of Sarus Cranes Grus antigone". J. Ecol. Soc. 16: 5–15. 
  12. ^ Marchant, S.; Higgins, P.J. (1993). Handbook of Australian, New Zealand & Antarctic birds. Oxford University Press, Melbourne.. 
  13. ^ Vigne, GT (1842). Travels in Kashmir, Ladak, Iskardo. Vol. 2. Henry Colburn,London. http://www.archive.org/stream/travelsinkashmir02vign#page/18/mode/2up. 
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  16. ^ Sundar, KSG; Choudhury, BC (2006). "Conservation of the Sarus Crane Grus antigone in Uttar Pradesh, India.". J. Bombay Nat. Hist. Soc. 103 (2-3): 182-190. 
  17. ^ Blyth, Edward (1881). The natural history of the cranes. R H Porter. pp. 45–51. http://www.archive.org/stream/cu31924000102149#page/n71/mode/2up/. 
  18. ^ Meine, Curt D. and George W. Archibald (Eds) (1996). The cranes: Status survey and conservation action plan. IUCN, Gland, Switzerland, and Cambridge, U.K.. ISBN 2831703263. 
  19. ^ Yule, Henry, Sir. (1903). Hobson-Jobson: A glossary of colloquial Anglo-Indian words and phrases, and of kindred terms, etymological, historical, geographical and discursive. New ed. edited by William Crooke, B.A.. J. Murray, London. http://dsal.uchicago.edu/dictionaries/hobsonjobson/. 
  20. ^ Stocqueler, JH (1848). The Oriental Interpreter. C. Cox, London. http://www.archive.org/stream/theorientalinter00stoc#page/202/mode/2up. 
  21. ^ Livesey,TR (1937). "Sarus flocks.". J. Bombay Nat. Hist. Soc. 39 (2): 420–421. 
  22. ^ a b c Ramachandran, NK; Vijayan, VS (1994). "Distribution and general ecology of the Sarus Crane (Grus antigone) in Keoladeo National Park, Bharatpur, Rajasthan.". J. Bombay Nat. Hist. Soc. 91 (2): 211–223. 
  23. ^ Acharya,Hari Narayan G (1936). "Sarus flocks.". J. Bombay Nat. Hist. Soc. 38 (4): 831. 
  24. ^ Hartert, Ernst & F Young (1928). "Some observations on a pair of Sarus Cranes at Tring". Novitates Zoologicae 34: 75–76. http://www.archive.org/stream/novitateszoologi34lond#page/74/mode/2up. 
  25. ^ Law,SC (1930). "Fish-eating habit of the Sarus Crane (Antigone antigone).". J. Bombay Nat. Hist. Soc. 34 (2): 582–583. 
  26. ^ Sundar, KSG (2000). "Eggs in the diet of the Sarus Crane Grus antigone (Linn.).". J. Bombay Nat. Hist. Soc. 97 (3): 428–429. 
  27. ^ Chauhan, R; Andrews, Harry (2006). "Black-necked Stork Ephippiorhynchus asiaticus and Sarus Crane Grus antigone depredating eggs of the three-striped roofed turtle Kachuga dhongoka.". Forktail 22: 174–175. 
  28. ^ Fitch, WT (1999). "Acoustic exaggeration of size in birds via tracheal elongation: comparative and theoretical analyses." (PDF). J. Zool., Lond. 248: 31–48. doi:10.1111/j.1469-7998.1999.tb01020.x. http://www.st-andrews.ac.uk/~wtsf/downloads/Fitch1999Trachea.pdf. 
  29. ^ Mukherjee, A. (2002). "Observations on the mating behaviour of the Indian Sarus Crane Grus antigone in the wild.". J. Bombay Nat. Hist. Soc. 99 (1): 108-113. 
  30. ^ Whistler, Hugh (1949). Popular Handbook Of Indian Birds. 4th edition. Gurney and Jackson, London. p. 446–447. http://www.archive.org/stream/popularhandbooko033226mbp#page/n495/mode/2up. 
  31. ^ Walkinshaw, Lawrence H. (1947). "Some nesting records of the sarus crane in North American zoological parks". The Auk 64 (4): 602–615. http://elibrary.unm.edu/sora/Auk/v064n04/p0602-p0615.pdf. 
  32. ^ Mukherjee, A; Soni, V.C.; Parasharya, C.K. Borad B.M. (12). "Nest and eggs of Sarus Crane (Grus antigone antigone Linn.)" (PDF). Zoos' Print Journal 15: 375–385. http://www.zoosprint.org/ZooPrintJournal/2000/December/375-385.pdf. 
  33. ^ Mukherjee, A; Soni, V.C.; Parasharya, C.K. Borad B.M. (12). "Nest and eggs of Sarus Crane (Grus antigone antigone Linn.)" (PDF). Zoos' Print Journal 15: 375–385. http://www.zoosprint.org/ZooPrintJournal/2000/December/375-385.pdf. 
  34. ^ Sundar, KSG & BC Choudhury (2005). "Effect of incubating adult sex and clutch size on egg orientation in Sarus Cranes Grus antigone". Forktail 21: 179–181. http://www.orientalbirdclub.org/publications/forktail/21pdf/Sundar-Sarus.pdf. 
  35. ^ Sundar, KSG & BC Choudhury (2005). "Effect of incubating adult sex and clutch size on egg orientation in Sarus Cranes Grus antigone". Forktail 21: 179–181. http://www.orientalbirdclub.org/publications/forktail/21pdf/Sundar-Sarus.pdf. 
  36. ^ Ricklefs RE, DF Bruning * G W Archibald. "Growth rates of cranes reared in captivity". The Auk 103 (1): 125–134. http://elibrary.unm.edu/sora/Auk/v103n01/p0125-p0134.pdf. 
  37. ^ a b Sundar, KSG & BC Choudhury (2003). "Nest sanitation in Sarus Cranes Grus antigone in Uttar Pradesh, India". Forktail 19. http://www.orientalbirdclub.org/publications/forktail/19pdfs/Sundar-Sarus.pdf. 
  38. ^ Sundar, KSG (2005). "Observations of mate change and other aspects of pair-bond in the Sarus Crane Grus antigone". J. Bombay Nat. Hist. Soc. 102 (1): 109–112. 
  39. ^ a b c Sundar, KSG (2009). "Are rice paddies suboptimal breeding habitat for Sarus Cranes in Uttar Pradesh, India?". The Condor 111 (4): 611-623. 
  40. ^ Choudhury, B.C.; Nair, A. (2008). "Conservation of the vulnerable Sarus Crane Grus antigone antigone in Kota, Rajasthan, India: a case study of community involvement.". Oryx 42 (3): 452-255. doi:10.1017/S0030605308000215. 
  41. ^ a b Aeshita Mukherjee, C. K. Borad and B. M. Parasharya (2002). "Breeding performance of the Indian sarus crane in the agricultural landscape of western India". Biological Conservation 105 (2): 263–269. doi:10.1016/S0006-3207(01)00186-0. 
  42. ^ Kaur J & BC Choudhury (2005). "Predation by Marsh Harrier Circus aeruginosus on chick of Sarus Crane Grus antigone antigone in Kota, Rajasthan". J. Bombay Nat. Hist. Soc. 102 (1): 102. 
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Other sources

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