Geronticus eremita

Geronticus eremita, Photo: Michael Lahanas

Life-forms

Superregnum: Eukaryota
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Ciconiiformes
Familia: Threskiornithidae
Subfamilia: Threskiornithinae
Genus: Geronticus
Species: Geronticus eremita

Name

Geronticus eremita (Linnaeus, 1758)

References

* IUCN link: Geronticus eremita (Linnaeus, 1758) (Critically Endangered)
* Systema Naturae ed.10 p.118

Vernacular names
Internationalization
Česky: Ibis skalní
Português: Íbis-de-topete
中文: 隱䴉

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The Northern Bald Ibis, Hermit Ibis, or Waldrapp (Geronticus eremita) is a migratory bird found in barren, semi-desert or rocky habitats, often close to running water. This 70–80 cm (28–31 in) glossy black ibis, which, unlike other members of the ibis family, is non-wading, has an unfeathered red face and head, and a long, curved red bill. It breeds colonially on coastal or mountain cliff ledges, where it typically lays 2–3 eggs in a stick nest, and feeds on lizards, insects, and other small animals.

The Northern Bald Ibis was once widespread across the Middle East, northern Africa and southern Europe, with a fossil record dating back at least 1.8 million years. It disappeared from Europe over 300 years ago, and is now considered critically endangered. There are believed to be about 500 wild birds remaining in southern Morocco, and fewer than 10 in Syria, where it was rediscovered in 2002. To combat these ebbing numbers, recent reintroduction programs have been instituted internationally, with a semi-wild breeding colony in Turkey, as well as sites in Austria, Spain and northern Morocco.

The reasons for the species' long-term decline are unclear, but hunting, loss of foraging habitat, and pesticide poisoning have been implicated in the rapid loss of colonies in recent decades.
Taxonomy

The ibises are gregarious, long-legged wading birds with long down-curved bills; along with the spoonbills they form one subfamily within the Threskiornithidae.[2] The Northern Bald Ibis's closest relative, and the only other member of the genus, is the Southern Bald Ibis, G. calvus, of southern Africa. The two Geronticus species differ from other ibises in that they have unfeathered faces and heads, breed on cliffs rather than in trees, and prefer arid habitats to the wetlands used by their relatives.[3][4]

The Northern Bald Ibis was described and illustrated by Swiss naturalist Conrad Gessner in his Historiae animalium in 1555,[5][6] and given the binomial name Upupa eremita by Carolus Linnaeus in his 1758 Systema naturae.[7] It was moved to its current genus by the German herpetologist Johann Georg Wagler in 1832.[8]
The species probably split into two distinct populations at least 400 years ago and, since then, the two populations have been diverging morphologically, ecologically, and genetically;[10] nevertheless, the Turkish and Moroccan populations of this ibis are not currently classed as separate subspecies.[1] One consistent difference between the eastern and western birds is a single mutation in the cytochrome b gene of their mitochondrial DNA.[11]

Fossils of the Northern Bald Ibis have been found at a Holocene (c. 10,000 years ago) site in southern France,[12] in middle Pleistocene (c. 900,000 ago) strata in Sicily,[13] and in Pliocene-Pleistocene boundary (c. 1.8 million years ago) deposits on the Mediterranean coast of Spain.[14] What appears to be an ancestral form, Geronticus balcanicus, was found in the late Pliocene of Bulgaria,[15] further illustrating the early widespread presence of this genus in Europe, and suggesting that Geronticus eremita may have originated in southeastern Europe or the Middle East.[13]

The genus name, Geronticus, is derived from the Ancient Greek γέρων, meaning old man and refers to the bald head of the aged.[16] Eremita is Late Latin for hermit, from the Greek ἐρημία, meaning desert,[17] and refers to the arid habitats inhabited by this species. The alternative common name Waldrapp is German for forest crow,[18] the equivalent of the Latin Corvo sylvatico of Gesner,[5] adapted as Corvus sylvaticus by Linnaeus.[7]

Description
The Northern Bald Ibis is a large, glossy black bird, 70–80 cm (28–31 in) long with a 125–135 cm (49–53 in) wingspan and an average weight of 1.0–1.3 kg (35–46 oz).[3] The plumage is black, with bronze-green and violet iridescence, and there is a wispy ruff on the bird's hind neck. The face and head are dull red and unfeathered, and the long, curved bill and the legs are red.[3] In flight, this bird has powerful, shallow and flexible wing beats. It gives guttural hrump and high, hoarse hyoh calls at its breeding colonies, but is otherwise silent.[19]

The sexes are similar in plumage, although males are generally larger than females,[3] and, as with other ibises that breed in colonies, have longer bills. The longer-billed males are more successful in attracting a mate.[20] The downy chick has uniformly pale brown plumage, and the fledged juvenile resembles the adult except that it has a dark head, light grey legs, and a pale bill. The unfeathered areas of the young bird's head and neck gradually become red as it matures.[3] Moroccan birds have a significantly longer bill than Turkish birds of the same sex.[21]
Population Male bill length Female bill length
Morocco 141.1 mm (5.55 in) 133.5 mm (5.25 in)
Turkey 129.0 mm (5.08 in) 123.6 mm (4.87 in)

If the eastern and western populations are considered to be separable subspecies, it is unclear which should be considered to be the nominate (first-named) form, since the first description of this species was based on a now-extinct population from Switzerland which is of unknown race.[5]

The Northern Bald Ibis is readily distinguished from its close relative, the Southern Bald Ibis of Southern Africa, by the southern species' whitish face.[4] The Northern Bald can also be confused with the similarly dark-plumaged Glossy Ibis, which overlaps its range, but it is larger and stockier than that species. In flight, when the bill and face colouration may not be visible, the Bald Ibis' less rounded wings and shorter neck give it a different profile from Glossy Ibis,[3] and its relatively short legs mean that its feet do not project beyond the tail, unlike those of the Glossy Ibis.[19]

Habitat and range

Unlike other ibises, which nest in trees and feed in wetlands, the Northern Bald Ibis breeds on undisturbed cliff ledges, and forages for food in irregularly cultivated, grazed dry areas such as semi-arid steppes, and fallow fields. The close proximity of adequate steppe feeding areas to breeding cliffs is an important habitat requirement.[22]
The Northern Bald Ibis was once widespread across the Middle East, northern Africa, and southern Europe; it bred along the Danube and Rhone Rivers, and in the mountains of Spain,Italy, Germany, Austria, and Switzerland (Gessner's original description was of a Swiss bird).[23] It used castle battlements as well as cliff ledges for nesting before vanishing from Europe at least three centuries ago.[3] It is also extinct over most of its former range, and now almost the entirety of the wild breeding population of just over 500 birds is in Morocco, at Souss-Massa National Park, where there are three documented colonies, and near the mouth of the Oued Tamri (north of Agadir), where there is a single colony containing almost half the Moroccan breeding population. There is some movement of birds between these two sites.[1]
Part of a flock in the Souss Massa stronghold

Religious traditions helped this species to survive in one Turkish colony long after the species had disappeared from Europe, since it was believed that the ibis migrated each year to guide Hajj pilgrims to Mecca. The ibis was protected by its religious significance, and a festival was held annually to celebrate its return north.[24] The Turkish ibis population was centred near the small town of Birecik in the south east of the country, and during the first half of the twentieth century, the Birecik colony maintained a relatively stable population of about 500 breeding pairs, reaching an estimated total population of about 3,000 around 1930. By the 1970s, numbers had drastically declined and a captive breeding program was initiated in 1977 with one adult pair and nine chicks taken from the wild. This program largely failed to revert the decline; there were 400 birds in 1982, five pairs in 1986 and seven pairs in 1987. Only three birds returned from their wintering grounds in 1989, and just one in 1990. The returning birds died before they could reproduce, thus rendering the species extinct in the wild in Turkey as of 1992. Once the wild Turkish population became non-viable, the colony was maintained as a flock which was free-flying for most of the year but caged in autumn to prevent migration.[25]
After the demise of the migratory Turkish colony, the Northern Bald Ibis was known to survive in the wild only at the Moroccan sites, although occasional sightings of birds in Yemen, Eritrea, Saudi Arabia and Israel during the 1980s and 1990s suggested that there was still a colony somewhere in the Middle East.[28] Intensive field surveys in spring 2002, based on the knowledge of Bedouin nomads and local hunters, revealed that the species had never become completely extinct on the Syrian desert steppes. Following systematic searches, 15 old nesting sites were found, one, near Palmyra, was still hosting an active breeding colony of seven individuals.[10][29][30] Although the ibis had been declared extinct in Syria more than 70 years earlier,[31] the bird appears to have been relatively common in the desert areas until 20 years ago, when a combination of overexploitation of its range lands and increasing hunting pressures initiated a dramatic decline.[29][30]

The Moroccan breeding birds are resident, dispersing along the coast after the nesting season. It has been suggested that coastal fog provides extra moisture for this population, and enables the ibises to remain year-round.[1] In the rest of its former range, away from the Moroccan coastal locations, the Northern Bald Ibis migrated south for the winter, and formerly occurred as a vagrant to Spain,Iraq, Egypt, the Azores and Cape Verde.[3]

Satellite tagging of 13 Syrian birds in 2006 showed that the three adults in the group, plus a fourth untagged adult, wintered together from February to July in the highlands of Ethiopia, where the species had not been recorded for nearly 30 years. They travelled south on the eastern side of the Red Sea via Saudi Arabia and Yemen, and returned north through Sudan and Eritrea.[26][32]

Behaviour

Breeding
The Northern Bald Ibis breeds in loosely spaced colonies, nesting on cliff ledges or amongst boulders on steep slopes, usually on the coast or near a river.[3] Volunteer climbers have created extra ledge spaces in the Souss-Massa colonies to ensure that breeding population is not limited by the availability of nest ledges,[22] and artificial nest boxes are used in the managed colony at Birecik.[33] In the past, the birds also nested in buildings.[3]

This ibis starts breeding at 3–5 years of age,[34] and pairs for life.[3] The male chooses a nest site, cleans it, and then advertises for a female by waving his crest and giving low rumbling calls. Once the birds have paired, the bond is reinforced through bowing displays and mutual preening. The nest is a loose construction of twigs lined with grass or straw.[3] G. eremita normally lays 2–4 rough-surfaced eggs, which weigh an average of 50.16 g (1.8 oz),[35] and are initially blue-white with brown spots, becoming brown during incubation.[3] An egg in the collection of the British Museum was marked more thickly at the broad end, with "spots and very small blotches of yellowish brown and pale rufous". It was 0.93 cm long and 0.68 cm wide (2.37 × 1.73 in).[36] The clutch is incubated for 24–25 days to hatching, the chicks fledge in another 40–50 days,[3] and the first flight takes place at about two months.[37] Both parents incubate and feed the chicks.[38]

The Northern Bald Ibis lives in captivity for an average of 20–25 years (oldest recorded male 37 years, oldest recorded female 30 years).[39] The average age in the wild has been estimated as 10–15 years.[34]

Feeding
This gregarious species commutes in flocks from the cliff breeding sites or winter roosts to its feeding areas, flying in a V-formation. The flocks may contain up to 100 birds in winter.[3] During the breeding season, the ibises regularly forage up to 15 km (10 mi) from the colony, and, although steppe not in current cultivation is preferred for feeding, they will also use fallow ground, and occasionally even actively cultivated fields.[22]

The Northern Bald Ibis consumes a very wide variety of mainly animal food; faecal analysis of the Moroccan breeding population has shown that lizards and tenebrionid beetles predominate in the diet,[22] although small mammals, ground-nesting birds and invertebrates such as snails, scorpions, spiders and caterpillars are also taken.[38] Males will sometimes "scrounge" food from females.[40] As the flock moves across the ground, the ibis uses its long bill to feel for food items in the loose, sandy soil. Since this bird hunts mainly by probing, a soft surface seems to be vital, and it is important that any vegetation is sparse, and not more than 15–20 cm (6–8 in) high.[38]

Conservation status
Although the Northern Bald Ibis was long extinct in Europe, many colonies in Morocco and Algeria survived until the early twentieth century, when they began to decline more rapidly, the last colony in Algeria disappearing in the late 1980s. In Morocco there were about 38 colonies in 1940 and 15 in 1975, but the last migratory populations in the Atlas Mountains had vanished by 1989.[38] The species is now officially critically endangered according to the IUCN scale, with an estimated population in 2008 of around 500 in the wild and over 1,000 in captivity.[1][38] The Northern Bald Ibis is one of the key species to which the draft Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies, and it has a detailed, internationally agreed conservation action plan under the agreement.[38] As a species that is threatened with extinction, it is listed on Appendix 1 of CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora), which means that trade in wild-caught birds is illegal, and may be licensed only in exceptional circumstances.[41][42]

The Northern Bald Ibis has declined for several centuries, at least partly as a consequence of unidentified natural causes.[1] The more rapid decline in the past hundred years, with a loss of 98% of the population between 1900 and 2002,[10] is the result of a combination of factors. These include significant human persecution, especially hunting, and also the loss of steppe and non-intensive agricultural areas (particularly in Morocco), pesticide poisoning, disturbance, and dam construction.[1] The discovery in Jordan of three dead adults from the Turkish colony confirmed that the overuse of pesticides is still a cause of death on migration. These birds were tracked by satellite after leaving Birecik; they stopped off briefly at the Syrian colony, and were later found dead in the Jordanian desert. Although the corpses were close to electricity pylons, the cause of death was poison, probably laid by chicken farmers to kill rodents.[27]

Wild populations
For the first time in the species' recorded history, there is now evidence of population growth in the wild, and the population in Morocco increased to 100 breeding pairs in the decade prior to 2008.[34] Simple site and species protection has facilitated this growth. Quantitative assessments of the importance of sites for breeding, roosting and foraging have guided actions to prevent disturbance and the loss of key areas to mass tourism development. Wardening by members of the local community has reduced human intrusion and increased the perceived value of the birds. The provision of drinking water and the removal and deterrence of predators and competitors enhances breeding prospects, and monitoring has confirmed that steppe and two-year fallows are key feeding habitats.[34]

Maintaining such non-intensive land uses in future may present major management challenges, and the recovery in the Souss-Massa region remains precarious because the population is concentrated in just a few places. However, it could provide opportunities for natural extension of the range to formerly occupied sites further north in Morocco.[34]
The main cause of breeding failure at the Souss-Massa National Park is the loss of eggs to predators,[1] especially the Common Raven which nest monitoring has shown to have had a serious impact at one sub-colony.[22] The effects of predators on adult birds have not been studied, but the very similar Southern Bald Ibis, Geronticus calvus, is hunted by large raptors, particularly those that share its breeding cliffs.[43] There is evidence of chick starvation in some years, but the main threats to breeding birds are human disturbance and the loss of feeding habitat.[22] There was a dramatic mortality incident at the Moroccan colonies in May 1996, when 40 adults died or disappeared over a period of nine days. Although analyses have not identified the cause, an obscure virus, a toxin, or botulism are thought to be the most likely causes of the deaths.[22]

The Syrian Ministry of Agriculture and Agrarian Reform has now put protection measures in place to protect the tiny breeding population in that country,[30] and Yemen and Ethiopia, which provide migration stop-offs and wintering areas, have a good record for conservation. However, young birds do not winter nor return with the adults and their wintering grounds are still unknown.[32] Although the wild Syrian population is very small, the discovery that semi-wild Turkish birds on a migration trial visited the Palmyra colony has led to hopes that some migrants may join the Syrian breeding population and boost the numbers in that country.[27]

Turkey

With the loss of the genuinely wild Turkish population, the Ministry of Environment and Forestry's Directorate of Natural Preservation and National Parks established a new semi-wild colony at Birecik. This was heavily managed, with birds taken into captivity after the breeding season to prevent migration.[1] The program was successful, with numbers at 91 as of July 2006. The intention is to allow the birds to migrate once the population reaches a stable 100 pairs, excluding young.[25]

The birds are released in late January or early February to breed outside the cages on ledges and, mainly, in the nest boxes in the breeding station compound. The ibises are free flying and forage around the Birecik area in forest nurseries, agricultural fields and along the Euphrates, but supplementary food is also provided. Following the end of the breeding season, the birds are taken into cages in late July or early August to prevent migration.[25] A trial migration using tagged birds confirmed the risks presented to travelling birds by pesticides.[27]

Reintroductions

The guidelines for the conservation and reintroduction of the Northern Bald Ibis were established in 2003 at an International Advisory Group for Northern Bald Ibis (IAGNBI) conference in Innsbruck at the Alpenzoo, which maintains the European studbook for the Northern Bald Ibis.[39][44]
Decisions taken at the meeting included:

* There should be no augmenting of the wild populations at Souss-Massa or in Palmyra using zoo-bred ibises.[45]
* There are two distinctive populations of Northern Bald Ibis, and the separate ranges of the eastern and western forms should be respected.[45]
* In order to prepare birds for release, groups of chicks should be hand-reared by human "parents".[46]
* Migration routes and stop-over points will have to be taught to young birds, since it is unlikely that they will discover this information by themselves.[46]

A second conference in Spain in 2006 stressed the need to survey potential and former sites in northwest Africa and the Middle East for currently undetected colonies. The need to raise the standards of hygiene and husbandry in the Birecik aviaries was reiterated, and the prevalence of skin problems in a number of zoos reinforced the view that no zoo birds should be used for any free-flying trials.[47] In future captive breeding and releasing programmes, only birds of known origin should be used.[11]

Zoo populations
There are 850 Northern Bald Ibises in European zoos and a further 250 in captivity in Japan and North America.[44] The 49 European zoos keeping this species produce 80–100 young birds per year, and earlier attempts at releasing captive-bred birds included close to 150 birds between 1976-86 from an aviary at Birecik, 75 from Tel Aviv Zoo in 1983, and an unspecified number from a project in Almería, Spain, from 1991 to 1994; all these attempts were unsuccessful.[48] All Northern Bald Ibises in zoos, other than those in Turkey, are of the western race, and were imported from Morocco. Three bloodlines exist; the earliest relates to importations to Zoo Basel, Switzerland in the 1950s and 1960s, the next is the descendants of birds taken in the 1970s to stock Rabat Zoo, and the last captured wild birds were those taken to the Naturzoo, Rheine, in 1976 and 1978.[49] Captive birds have a high incidence of skin problems, and 40% of those birds that had to be put down suffered from chronic ulcerative dermatitis, characterised by feather loss, rawness, and ulceration on the back, neck, and the undersides of the wings. The cause of this disease is unknown.[50] Other major disease problems reported in zoo collections have been avian tuberculosis, gastric foreign bodies, bone disease, and heart problems.[51] An outbreak of West Nile virus in Bronx Park, New York, involved Northern Bald Ibises amongst many other species of birds and mammals.[52]

Europe

The Northern Bald Ibis became one of the world's earliest officially protected species in 1504, thanks to a decree by Archbishop Leonhard of Salzburg, but died out in Austria as elsewhere in Europe.[53] There are now two ibis reintroduction projects in the country; a research station at Grünau has a breeding colony managed, like the Turkish population, as a free-flying flock which is caged at migration time. The aim here is to investigate flock interactions and hormonal status, behavioural and ecological aspects of natural foraging, and the establishment of traditions via social learning.[49]
The Scharnstein Project is an attempt to establish a migratory Waldrapp colony by using ultralight planes to teach a migration route. The scheme builds on the Grünau rearch by developing a method to control and guide the autumn migration of a founder population, which then can pass this migration tradition to subsequent generations. In May 2002, 11 birds from the Vienna Zoo and the Grünau colony were trained to follow two microlight planes, and in 2003, a first attempt was made to lead a group of birds from Scharnstein to southern Tuscany. Due to adverse weather and technical problems, the birds had to be transported by road over a considerable part of the distance.[49] The subsequent releases were more successful, with birds wintering in Tuscany, and, from 2005, returning to northern Austria. In 2008, a female ibis named Aurelia flew 930 km (580 mi) back to Austria for her fourth return to the breeding site. The hazards of the journey are shown by the loss of her two offspring and her mate while on the southern journey in the autumn of 2007.[54]

Proyecto Eremita is a Spanish reintroduction involving the release of nearly 30 birds in the Ministry of Defence training ground in La Janda district, Barbate (Cádiz Province). It had its first success in 2008, when a pair laid two eggs. This is the probably the first attempt to breed in the wild in Spain for 500 years; the last definite reference to the Northern Bald Ibis breeding in Spain is from a 15th-century falconry book.[55] This effort has been undertaken by the Andalusian government’s Environmental Ministry, the Spanish Ministry of Defence, and the Jerez Zoo and Botanical Gardens, with the assistance of the Doñana National Park and volunteers from the Cádiz Natural History Society.[55][56][57] Previously, two birds left the area in 2005 and 14 in 2006, but nothing is known of their whereabouts other than that a ringed bird from Spain was seen in the Middle Atlas, Morocco in 2005.[49]

Northern Morocco
There is a planned reintroduction of the ibis at Ain Tijja-Mezguitem in the north-east of Morocco. Since the wild populations further south remain vulnerable, and the porous sandstone of their breeding ledges is exposed to erosion, the intention is to establish a non-migratory population (stocked from German, Swiss and Austrian zoos) in an area where this species was know to have bred up to about 1980. The station in the Rif mountains was built in 2000, and stocked with the first group of zoo-bred birds. A second importation of zoo-bred birds and the construction of an information centre took place in 2004. Six pairs bred in 2006 subsequent to a change in the birds' diet, and six offspring from five nests were successfully reared. In 2007 there were 19 birds (13 adults and six juveniles) in the aviary.[58]

The rock walls of the mountains have many potential breeding ledges, and an artificial lake provides water to the birds and to the local human population. Steppe pasture which is not exposed to herbicides or pesticides gives good foraging. Once the population reaches around 40 birds, a release will be initiated, subject to international agreement. The reintroduction site is 760 km (475 mi) from Agadir on the other side of the Atlas Mountains, so accidental contamination of the wild colonies is unlikely.[59]

In culture
According to local legend in the Birecik area, the Northern Bald Ibis was one of the first birds that Noah released from the Ark as a symbol of fertility,[53] and a lingering religious sentiment in Turkey helped the colonies there to survive long after the demise of the species in Europe, as described above.[24]

This ibis was revered as a holy bird and a symbol of brilliance and splendour in Ancient Egypt;[60][61] together with the Sacred Ibis, it was regarded as a reincarnation of Thoth, scribe of the gods, who was usually depicted with a man's body and the head of an ibis. The Old Egyptian word akh, "to be resplendent, to shine", was denoted in hieroglyphs by a Bald Ibis, presumably as a reference to its glossy plumage.[62] In a more abstract sense, akh stood for excellence, glory, honour and virtue.[61] It has also been used to signify the soul or spirit, one of five elements constituting personality.[63]
Herodotus wrote of the man-eating Stymphalian birds, which had wings of brass and sharp metallic feathers they could fire at their victims; ridding Lake Stymphalia in Arcadia of these creatures was one of the twelve labours of Heracles. These mythical birds are sometimes considered to be based on the Northern Bald Ibis,[53] but since they were described as marsh birds, and usually depicted without crests, the legendary species is more likely to be derived from the Sacred Ibis.[64] Some depictions, such as the 6th century BC Athenian black-figure amphora in the British Museum, clearly show the black head and white body of the latter species.[65] After the Bald Ibis became extinct in Central Europe, some later writers thought that Gesner's description was itself one of several in his book depicting mythical creatures.[53]

Several countries have produced postage stamps which depict the Northern Bald Ibis. They include Algeria, Morocco, Sudan, Syria, Turkey, and Yemen, which are breeding or migration locations; Austria, which is seeking to reintroduce the bird; and Jersey,[66] which has a small captive population.[67]

Notes

1. ^ a b c d e f g h i BirdLife International (2008). Geronticus eremita. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 5 November 2008. Database entry includes a range map and justification for why this species is critically endangered
2. ^ del Hoyo et al. (1992) p.472 "Threskiornithidae (Ibises and Spoonbills)"
3. ^ a b c d e f g h i j k l m n o Snow (1998) pp.146–147
4. ^ a b Sinclair (2002) p.74
5. ^ a b c Gessner (1551) pp.337–8 "Corvo sylvatico"
6. ^ Rare Birds Yearbook 2009. England: MagDig Media Limited. 2008. pp. 114–115. ISBN 978-0-9552607-5-9.
7. ^ a b Linnaeus (1758) p.118 U. viridis, capite flavo, cervice jubata. Corvus sylvaticus
8. ^ Wagler (1832) volume 25 column 1232
9. ^ Gesner (1551) p.337
10. ^ a b c Serra, G.; Abdallah M.; Abdallah A.; Al Qaim G.; Fayed T.; Assaed A.; Williamson D. (2003). "Discovery of a relict breeding colony of Northern Bald Ibis Geronticus eremita in Syria" (PDF). Oryx 38 (1): 1–7. doi:10.1017/S003060530400016X. http://www.danadeclaration.org/pdf/ibis_ORYX.pdf.
11. ^ a b Pegoraro, Karin; Föger, Manfred; Parson, Walther (October 2001). "First evidence of mtDNA sequence differences between Northern Bald Ibises (Geronticus eremita) of Moroccan and Turkish origin". Journal of Ornithology 142 (4): 425–28. doi:10.1007/BF01651340.
12. ^ Mourer-Chauviré, Cécile; Philippe, Michel; Guillard, Stéphane; Meyssonnier, Marcel (July 2006). "Presence of the Northern Bald Ibis Geronticus eremita (L.) during the Holocene in the Ardèche valley, southern France". Ibis 148 (4): 820–23. doi:10.1111/j.1474-919X.2006.00563.x.
13. ^ a b Boev, Zlatozar (2000). "Additional material of Geronticus balcanicus Boev, 1998, and precision of the age of the type locality" (PDF). Acta Zoologica Bulgarica 52 (2): 53–58. http://www.haltakov.com/8group/zb/sci/137_boev_2000_geronticus_additional_azb.pdf. Retrieved 2008-12-29.
14. ^ Marco, Antonio Sanchez (July 1996). "The presence of the Waldrapp Geronticus eremita (Plataleidae) in the Plio-Pleistocene boundary in Spain." (PDF). Ibis 138 (3): 560–61. doi:10.1111/j.1474-919X.1996.tb08081.x. http://www.avesfosiles.com/PDFs/Ref_27.pdf.
15. ^ Boev, Zlatozar (1998). "Presence of Bald Ibises (Geronticus Wagler, 1832) (Threskiornithidae - Aves) in the Late Pliocene of Bulgaria". Geologica Balcanica 28 (1–2): 45–52.
16. ^ Brook (2006) p. 507
17. ^ Brook (2006) p. 621
18. ^ Brook (2006) p. 1713
19. ^ a b Mullarney (1999) p.36
20. ^ Babbitt, Gregory A.; Frederick, Peter C. (2007). "Selection for sexual bill dimorphism in ibises: an evaluation of hypotheses.". Waterbirds 30 (2): 199–206. doi:10.1675/1524-4695(2007)30[199:SFSBDI2.0.CO;2].
21. ^ Siegfried, W.R. (1972). "Discrete breeding and wintering areas of the Waldrapp Geronticus eremita (L.)". Bulletin of the British Ornithologists’ Club 92: 102–103.
22. ^ a b c d e f g "Northern bald ibis". International research. Royal Society for the Protection of Birds (RSPB). http://www.rspb.org.uk/ourwork/science/international/northernbaldibis/research_details.asp. Retrieved 16 November 2008.
23. ^ Gesner (1551) pp. 337–38 Eremita montanus helveticus and habitat in Helvetia
24. ^ a b Beintema, Nienke. "Saving a charismatic bird" (PDF). AEWA Secretariat. http://www.unep-aewa.org/publications/saving_charismatic_bird.pdf. Retrieved 11 December 2008.
25. ^ a b c (Turkish) "Çevre Ve Orman Bakanliği". The Birecik Bald Ibis Breeding and Repopulation Program. Turkish Ministry of Environment and Forestry Directorate of Natural Preservation and National Parks. http://www.milliparklar.gov.tr/bolumler/avyaban/icerik/cakcan/kelaynak_dosyalar/frame.htm. Retrieved 13 November 2008
26. ^ a b "Northern bald ibis in Syria". Satellite tracking. Royal Society for the Protection of Birds (RSPB). http://www.rspb.org.uk/ourwork/science/international/tracking/northern_bald_ibis.asp. Retrieved 14 November 2008.
27. ^ a b c d "Poison blamed for Ibis' deaths". News 27-10-2008. BirdLife International. http://www.birdlife.org/news/news/2008/10/bald_ibis_poisonings.html. Retrieved 14 November 2008.
28. ^ Schulz, Holger; Schulz, Maria (April 1992). "New records of the Bald Ibis (Geronticus eremita) from Saudi Arabia". Journal of Ornithology 133 (2): 165–172. doi:10.1007/BF01639909.
29. ^ a b Serra, G. (2003). "Discovery of Northern Bald Ibises in Syria". World Birdwatch (BirdLife International magazine) 25 (1): 10–13.
30. ^ a b c Murdoch, D. A.; Betton, K. F. (2008). "A Checklist of the Birds of Syria". Sandgrouse Supplement 2: 18–19.
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References

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