The white-eyed gull (''Ichthyaetus leucophthalmus'') is a small

gull Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, m ...

that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

Red Sea The Red Sea ( ar, البحر الأحمر - بحر القلزم, translit=Modern: al-Baḥr al-ʾAḥmar, Medieval: Baḥr al-Qulzum; or ; Coptic: ⲫⲓⲟⲙ ⲛ̀ϩⲁϩ ''Phiom Enhah'' or ⲫⲓⲟⲙ ⲛ̀ϣⲁⲣⲓ ''Phiom ǹšari''; T ...

. Its closest relative is the

sooty gull The sooty gull (''Ichthyaetus hemprichii'') is a species of gull in the family Laridae, also known as the Aden gull or Hemprich's gull. It is found in Bahrain, Djibouti, Egypt, Eritrea, India, Iran, Israel, Jordan, Kenya, Lebanon, Maldives, Mozam ...

. It is one of the world's rarest gulls, with a population of 4,000 – 6,500 pairs. The species is classed as

Near Threatened A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature as that may be vulnerable to endangerment in the near future, but it does not currently qualify fo ...

by the

IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

;

human Humans (''Homo sapiens'') are the most abundant and widespread species of primate, characterized by bipedalism and exceptional cognitive skills due to a large and complex brain. This has enabled the development of advanced tools, culture, ...

pressure and

oil pollution An oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and is a form of pollution. The term is usually given to marine oil spills, where oil is released into th ...

are deemed the major threats. As is the case with many gulls, it has traditionally been placed in the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

Larus ''Larus'' is a large genus of gulls with worldwide distribution (by far the greatest species diversity is in the Northern Hemisphere). Many of its species are abundant and well-known birds in their ranges. Until about 2005–2007, most gulls ...

''.Pons J.M., Hassanin, A., and Crochet P.A.(2005). ''Phylogenetic relationships within the Laridae (Charadriiformes: Aves) inferred from mitochondrial markers.'' Molecular Phylogenetics and Evolution 37(3):686–699

Morphology

Adult white-eyed gulls have a

black Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have o ...

hood in breeding

plumage Plumage ( "feather") is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, ...

, which extends down onto the upper throat, and on the neck-sides is bordered below by a narrow

white White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light. White on ...

bar. The upperparts and inner upperwings are medium-dark

grey Grey (more common in British English) or gray (more common in American English) is an intermediate color between black and white. It is a neutral or achromatic color, meaning literally that it is "without color", because it can be composed o ...

; the breast is mid-grey but the rest of the underparts are white. The secondaries are black with a white trailing edge, and the primaries are black. The underwing is dark and the tail white. Adults in non-breeding plumage are similar, but the hood is flecked white small white spots. The white-eyed gull acquires adult plumage at two to three years of age. Juvenile birds have a very different plumage—chocolate

brown Brown is a color. It can be considered a composite color, but it is mainly a darker shade of orange. In the CMYK color model used in printing or painting, brown is usually made by combining the colors orange and black. In the RGB color model used ...

on the head, neck and breast, and with brown, broadly pale-fringed,

feather Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates and a premier ...

s to the upperparts and upperwings, and a black tail. In their first winter, birds acquire greyer feathering on their head, breast and upperparts; the second-winter plumage is closer to that of the adult, but lacking the hood. A distinctive feature of white-eyed gull at all ages is its long slender

bill Bill(s) may refer to: Common meanings * Banknote, paper cash (especially in the United States) * Bill (law), a proposed law put before a legislature * Invoice, commercial document issued by a seller to a buyer * Bill, a bird or animal's beak Plac ...

. This is black in younger birds, but in adults it is deep

red Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. It is a primary color in the RGB color model and a secondar ...

with a black tip. The legs are

yellow Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the R ...

—dullest in younger birds, brightest in breeding plumaged adults. The eye itself is not white; the bird takes its name from white eye-crescents, which are present at all ages.

Distribution

The white-eyed gull breeds on inshore islands with rocks and sandy beaches, such as the

Siyal Islands The Siyal Islands are a group of islands off the coast of northeastern Africa, located in the Red Sea. The islands are located in the Halaib Triangle, which is claimed by both Sudan and Egypt, as part of an ongoing border dispute. Since the 1990s, ...

, in the Red Sea from July to September. For the rest of the year it occurs throughout the Red Sea, with some birds travelling to

Oman Oman ( ; ar, عُمَان ' ), officially the Sultanate of Oman ( ar, سلْطنةُ عُمان ), is an Arabian country located in southwestern Asia. It is situated on the southeastern coast of the Arabian Peninsula, and spans the mouth of t ...

and

Somalia Somalia, , Osmanya script: 𐒈𐒝𐒑𐒛𐒐𐒘𐒕𐒖; ar, الصومال, aṣ-Ṣūmāl officially the Federal Republic of SomaliaThe ''Federal Republic of Somalia'' is the country's name per Article 1 of thProvisional Constituti ...

References

* Malling Olsen, Klaus and Hans Larsson (2004) ''

Gulls of Europe, Asia and North America ''Gulls of Europe, Asia and North America'' by Klaus Malling Olsen and Hans Larsson is a volume in the ''Helm Identification Guides'' series of bird identification books. The book is intended to succeed Peter J. Grant's '' Gulls: A Guide to Iden ...

'' {{Taxonbar, from=Q912041

white-eyed gull The white-eyed gull (''Ichthyaetus leucophthalmus'') is a small gull that is endemic to the Red Sea. Its closest relative is the sooty gull. It is one of the world's rarest gulls, with a population of 4,000 – 6,500 pairs. The species is c ...

Birds of East Africa Birds of the Arabian Peninsula

Taxobox binomials not recognized by IUCN Taxa named by Coenraad Jacob Temminck