Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Cladus: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Passeriformes
Subordo: Passeri
Infraordo: Corvida
Superfamilia: Corvoidea
Familia: Corvidae
Genus: Cyanocorax
Species: Cyanocorax yucatanicus
Subspecies: C. y. rivularis - C. y. yucatanicus
Name
Cyanocorax yucatanicus (Dubois, 1875)
Vernacular names
čeština: sojka yukatanská
dansk: Yucatánblåskade
Deutsch: Yucatanblaurabe
English: Yucatan Jay
Esperanto: Jukatana garolo
español: Chara Yucateca
suomi: jukataninharakka
français: Geai du Yucatan
italiano: Ghiandaia delloYucatan
日本語: ユカタンヌレバカケス, yukatannurebakakesu
Nederlands: Yucatángaai
norsk: Yucatánskrike
polski: modrowronka jukatańska
русский: Юкатанская сойка
slovenčina: kapuciarka žltonohá
svenska: Yucatanskrika
中文: 尤卡蓝鸦
References
Bull.Acad.R.Sci.Lettr.Beaux-ArtsBelg. (2) 40 p. 797
The Yucatan jay (Cyanocorax yucatanicus) is a species of bird in the family Corvidae, the crows and their allies. It is native to the Yucatán Peninsula where its habitats are subtropical or tropical dry forest, plantations and cleared areas at altitudes up to 250 m (820 ft). Adults are about 30 cm (12 in) long, black, with blue wings, mantle, and tail, black bills, yellow eye rings and legs. Immature birds have yellow bills. This is a common species of jay with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".
Taxonomy
The Yucatan jay was first described by the naturalist Alphonse Dubois in 1875. It originally places in the genus Cyanocitta, and was given the scientific name Cyanocitta yucatanica.[2] It is now placed by the genus Cyanocorax, which was introduced by the German zoologist Friedrich Boie in 1826, as Cyanocorax yucatanicus.[3][4] In 1934, ornithologist Carl Eduard Hellmayr reorganized the genus Cyanocorax and split it into four subgenera. The Yucatan jay was placed into the subgenus Cissilopha as Cissilopha yucatanica.[5] This is now considered a synonym for the Yucatan jay.[6]
When Hellmayr created the subgenus Cissilopha, he placed the bushy-crested jay, the San Blas jay, and the purplish-backed jay into it along with the Yucatan jay based on their similar plumage.[7] This relationship was confirmed by a 2010 mitochondrial DNA study, which showed that these four species were closely related. The Yucatan jay is basal to a sister group formed by the San Blas jay and the Purplish-backed jay.[8]
The following cladogram (simplified from the 2010 study) shows the relationship between species in the genus Cyanocorax.[8]
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The Yucatan jay has two recognized subspecies.[3]
C. yucataniucs yucatanicus: Found in Yucatán, Quintana Roo, and Campeche (except the southwest portion) in southeastern Mexico; Petén in northern Guatemala; and northern Belize.[9]
C. yucatanicus rivularis: Found in Tabasco and southwestern Campeche in southeastern Mexico.[9] Somewhat larger, and with a silvery tinge to the blue upperparts.[10]
Description
The adult Yucatan jay has a black head, nape, and underparts. The back, wings, and tail are a sharp blue colour. It has black irises, black eye rings, a black beak, and yellow legs and feet. There is no difference between the sexes.[11]
Moults
Juveniles have distinct white heads and bodies, but this fades within a few weeks of fledging
The Yucatan jay has several distinct plumages throughout its life cycle. Juvenile Yucatan jays have a white head, body, and tail tip. The back is a soft blue, and the wings and tail are a soft grey, aside from the outer retrices which are white. The beak, legs, and feet are a soft yellow tinged with pink. The inside of the beak is white and the irises are dark brown.[12] These features start to fade a few weeks after they fledge.[10] At this point, the legs, feet, beak, and eye ring become more distinctly yellow. The prebasic moult also begins at this point, with the white head and body feathers being replaced with black ones.[12]
The yellow beak and eye rings begin to fade to black within their second year
During the first year, the Yucatan jay has an entirely black head and body. The legs, feet, and eye rings remain yellow. The inside of the beak remains white, but takes on a glaucous tone. The wings become bluer, and the tail becomes a purplish blue colour. The back and tail turn a deeper grey, and the retrices are tipped with white. In June or August, the bill may start to develop dark patches, while remaining overall yellow. In September, the dark patches expand further.[13]
In its second year, the Yucatan jay's plumage is the same as that of the adult. The beak is still mottled, and by March it is primarily black with only some yellow marks, becoming entirely black within the second year. The legs and feet remain yellow. The eye ring is still distinctive of age, with some black marks appearing on the otherwise yellow flesh. By the third year, this eye ring is almost entirely black. The darkening of the beak and eye ring usually progress at the same rate. The inside of the beak starts to darken at this point as well. Any trace of yellow on both the beak and eye rings are gone by January of the third year. In the fourth year and later, the Yucatan jay has reached its full adult plumage.[14]
Measurements
The Yucatan jay is a medium sized jay, averaging 31–33 cm (12–13 in) long.[15] There is some variation in size between the sexes. The average wing length for adults is 141 mm (5.6 in) for males and 139.5 mm (5.49 in) for females, and the average tail length is 142.5 mm (5.61 in) for males and 141.5 mm (5.57 in) for females. Both sexes have an average beak length of 22.5 mm (0.89 in), an average beak depth of 12.7 mm (0.50 in), and average tarsus length of 41 mm (1.6 in), and an average middle toe length of 25 mm (0.98 in).[16] The male is also slightly heavier, weighing 114.4–127.8 g (4.04–4.51 oz) compared to the female who weighs 105.4–121 g (3.72–4.27 oz).[17]
Similar species
The Yucatan jay is visually unique within its range, with no similar species. Outside of its range, it is similar to the San Blas jay, the purplish-backed jay, and the bushy-crested jay. All three have a yellow iris whereas the Yucatan jay has a black iris, and are a brighter shade of blue on their upperparts.[18][10]
Range and habitat
The Yucatan jay is found primarily in the Yucatán Peninsula, which comprises the northern part of the nation of Belize; Guatemala's northern El Petén Department; and the Mexican states of Yucatán, Quintana Roo, and Campeche. It is also present in parts of the neighbouring states of Chiapas and Tabasco.[1]
The habitats of the Yucatan Jay vary slightly depending on the subspecies. The nominate species (C. y. yucatanicus) is found most often in both humid and scrubby forests, but can also be found in coastal scrub. C. y. rivularis, found in the southwest portion of the Yucatan peninsula, can be found in almost any type of forest. It can also be found in pine forests and swamps, however it is not common in these areas. Both subspecies can be found at elevations up to 500 m (1,600 ft).[10][19] The Yucatan jay is non-migratory.[20]
Status
The Yucatan jay is a common species throughout most of its wide range. Its population is considered stable, and as of 2020 there are an estimated 50,000–500,000 mature individuals in the wild. No particular threats have been identified, and the International Union for Conservation of Nature has rated its conservation status as being of least concern.[1]
Citations
BirdLife International (2020).
Dubois (1875), p. 797.
Gill, Donsker & Rasmussen (2021).
Boie (1826), Col 975.
Hellmayr (1934), p. 39.
Lepage.
Bonaccorso et al. (2010), p. 898.
Bonaccorso et al. (2010), p. 902.
Duvall & Kirwan (2020), Systematics.
Madge & Burn (1994), p. 82.
Madge & Burn (1994), pp. 81–82.
Hardy (1973), p. 85.
Hardy (1973), pp. 85–86.
Hardy (1973), p. 82.
Madge & Burn (1994), p. 81.
Ridgway (1904), p. 315.
Duvall & Kirwan (2020), Plumaes, Molts, and Structure.
Duvall & Kirwan (2020), Identification.
Raitt & Hardy (1976), p. 530.
Duvall & Kirwan (2020), Movements and Migration.
References
BirdLife International (2020). "Cyanocorax yucatanicus". IUCN Red List of Threatened Species. 2020: e.T22705693A137744682. doi:10.2305/IUCN.UK.2020-3.RLTS.T22705693A137744682.en. Retrieved 11 November 2021.
Boie, Friedrich (1826). "Generalübersicht". Isis von Oken (in German). Col 975.
Bonaccorso, Elisa; Peterson, A. Townsend; Navarro-Sigüenza, Adolfo G.; Fleischer, Robert C. (March 2010). "Molecular systematics and evolution of the Cyanocorax jays". Molecular Phylogenetics and Evolution. 54 (3): 897–909. doi:10.1016/j.ympev.2009.11.014. hdl:1808/6568. PMID 19931623. Retrieved 10 February 2024.
Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 14.1)". Archived from the original on October 4, 2020. Retrieved February 20, 2024.
Dubois, Alphonse (1875). "Cyanocitta yucatanica". Bulletins de l'Académie royale des sciences, des lettres et des beaux-arts de Belgique. 2 (40): 797. OCLC 1589466.
Duvall, Abigail; Kirwan, Guy M. (4 March 2020). "Yucatan Jay (Cyanocorax yucatanicus)". Birds of the World. doi:10.2173/bow.yucjay1.01.
Hardy, John William (1973). "Age and sex differences in the black-and-blue jays of Middle America" (PDF). Bird-Banding: A Journal of Ornithological Investigation. 44 (2): 81–90. Retrieved 9 March 2024.
Hellmayr, Charles E (1934). "Cissilopha yucatanica". Catalogue of birds of the Americas and the adjacent islands in Field Museum of Natural History and including all species and subspecies known to occur in North America, Mexico, Central America, South America, the West Indies, and islands of the Caribbean Sea, the Galapagos Archipelago, and other islands which may properly be included on account of their faunal affinities. 13 (7): 39–40. doi:10.5962/bhl.title.5570. OCLC 13897940.
Lepage, Denis. "Yucatan jay". Avibase. Retrieved 15 March 2024.
Madge, Steve; Burn, Hilary (1994). Crows and jays: a guide to the crows, jays, and magpies of the world. Boston: Houghton Mifflin. pp. 81–82. ISBN 039567171X.
Raitt, Ralph J; Hardy, John William (December 1976). "Behavioral Ecology of the Yucatan Jay" (PDF). The Wilson Bulletin. 88 (4). Wilson Ornithological Society: 529–721.
Ridgway, R. (1904). "The Birds of North and Middle American Part III". Bulletin of the United States National Museum. 50: 315. ISSN 0096-2961. OCLC 7347186.
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