Fine Art

San Blas Jay

Superregnum: Eukaryota
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
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: 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: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Passeriformes
Subordo: Passeri
Parvordo: Corvida
Superfamilia: Corvoidea

Familia: Corvidae
Genus: Cyanocorax
Species: Cyanocorax sanblasianus

Subspecies: C. s. nelsoni - C. s. sanblasianus

Cyanocorax sanblasianus (Lafresnaye, 1842)
Vernacular names
English: San Blas jay
Magasin de Zoologie (2) 4 pl.28,text

The San Blas jay (Cyanocorax sanblasianus) is a species of bird in the family Corvidae. It is endemic to Mexico where its natural habitat is subtropical or tropical dry forests; it is a common species and has been rated as "least concern" by the IUCN.[1]


The adult San Blas jay is between 27 and 35 cm (11 and 14 in) long and weighs between 92 and 122 g (3 and 4 oz). The sexes are similar; the adult has back, rump, wings and tail blue and the remaining plumage black. There is a small crest on the front of the head, the bill is black, the irises are white and the legs are black. The juveniles are similar apart from a larger crest, a yellow bill and brown eyes.[2]

This jay is endemic to Mexico. There are two subspecies; C. s. nelsoni is found in southwestern Mexico, from Nayarit, Jalisco and Colima southward to western Guerrero; and C. s. sanblasianus is found in the coastal region of Guerrero. The habitat includes dry and semi-moist woodland, thickets, groves and plantations as well as mangrove areas. This bird is not found deep in the forest.[2][3]

The species is social, living in small groups of up to thirty individuals including six to ten breeding pairs. These occupy a large territory but have little interaction with neighbouring groups. The birds seem to have stable pair bonds and most start breeding at three years old. The nests are grouped socially in trees, vines or shrubs, often in the crowns of palm trees. Each is constructed of twigs and lined with soft plant material, and a clutch of up to four mottled eggs is laid. Non-breeding females sometimes take short turns at incubation, which takes about eighteen days. Both parents care for the young, and several birds may help feed the chicks, especially after they have fledged.[4]

The San Blas jay is omnivorous, the birds feeding both on the ground and in the lower parts of trees. The diet consists of insects and other invertebrates, fruit and small vertebrates such as lizards.[4] This bird has been observed taking nestlings from the nest of a ruddy ground dove (Columbina talpacoti).[5]

BirdLife International (2020). "Cyanocorax sanblasianus". IUCN Red List of Threatened Species. 2020: e.T22705687A137745177. doi:10.2305/IUCN.UK.2020-3.RLTS.T22705687A137745177.en. Retrieved 13 November 2021.
Edwards, Ernest Preston (1998). A Field Guide to the Birds of Mexico and Adjacent Areas: Belize, Guatemala, and El Salvador. University of Texas Press. p. 118. ISBN 978-0-292-72091-6.
dos Anjos, L. "San Blas Jay (Cyanocorax sanblasianus)". Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. Retrieved 15 July 2016.
Madge, Steve (2010). Crows and Jays. Bloomsbury Publishing. pp. 81–82. ISBN 978-1-4081-3169-5.
Gurrola Hidalgo, Marco A.; Sanchez-Hernandez, Cornelio; RomeraAlmara, María de Lourdes (2009). "Novel food sources for Quiscalus mexicanus and Cyanocorax sanblasianus in Chamela, Jalisco coast, Mexico". Acta Zoológica Mexicana. 25 (2). ISSN 0065-1737.

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