Azure jay
| Azure jay | |
|---|---|
| |
| In Curitiba, Brazil | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Corvidae |
| Genus: | Cyanocorax |
| Species: | C. caeruleus
|
| Binomial name | |
| Cyanocorax caeruleus (Vieillot, 1818)
| |
| |
| Approximate distribution in green | |
The azure jay (Cyanocorax caeruleus) (Brazilian Portuguese: gralha-azul[2]) is a Near Threatened species of passeriform bird in the family Corvidae, the crows and jays.[1][3] It is found in Argentina, Brazil, and possibly Paraguay and Uruguay.[2][4]
Taxonomy and systematics
[edit]The azure jay was originally described in 1818 as Pica caerulea, mistakenly identifying it as a magpie.[5] The specific epithet's ending was changed to the masculine "us" to agree with the gender of genus Cyanocorax. However, taxonomic systems do not agree on its spelling. AviList and BirdLife International's Handbook of the Birds of the World use caeruleus.[6][7] The IOC, the Clements taxonomy, and the independent South American Classification Committee (SACC) spell it coeruleus.[3][8][9] This article uses the latter spelling.
The azure jay is monotypic.[3] Some authors treat the azure jay and the purplish jay (C. cyanomelas) as a superspecies.[9]
Description
[edit]The azure jay is 38 to 40 cm (15 to 16 in) long; one individual weighed 272 g (9.6 oz). The sexes have the same plumage that includes a short bushy crest on the forecrown. Adults have a sooty or black head, neck, and upper breast. The rest of their plumage is somewhat variable, with cobalt-blue, purplish blue, and greenish blue individuals. They have a dark brown iris, a black bill, and black legs and feet.[2][10]
Distribution and habitat
[edit]The azure jay is found in Brazil from southern São Paulo south through Paraná, Santa Catarina, and Rio Grande do Sul almost to Uruguay.[2][10] Its range continues into the northeastern Argentinian provinces of Formosa, Chaco, Corrientes, and Misiones.[11] Most sources include eastern Paraguay in its range.[3][6][8] There are historical records there whose identification is disputed and sight records from the late 1900s.[2] The SACC has no records in that country but includes Uruguay in its range.[4] BirdLife International includes Uruguay and questions its presence in Paraguay.[1]
The azure jay inhabits humid evergreen forest, especially that dominated by Araucaria species.[2][10] In elevation it ranges from sea level to 1,000 m (3,300 ft).[10]
Behavior
[edit]Movement
[edit]The azure jay is a year-round resident.[1]
Feeding
[edit]The azure jay is omnivorous but its diet has not been fully described. However, it appears to feed heavily on Araucaria fruits and seeds, and "plays an important role in [its] seed dispersal". It also is known to feed on other fruits, arthropods, small mammals, and eggs, and has been observed scavenging from a fresh cow carcass. It forages in small flocks that sometimes inclue plush-crested jays (C. chryops).[2]
Breeding
[edit]The azure jay's breeding season spans October to March. It is believed to be a cooperative breeder. Its nest is a flat cup made from twigs lined with softer roots. The clutch is four eggs that are greenish blue with gray and brown spots. Nothing else is known about the species' breeding biology.[2]
Vocalization
[edit]The azure jay has a wide variety of vocalizations, the most prominent of which is shrill and is written "Kiaahh- kiaahh- kiaahh".[2]
Status
[edit]The IUCN originally in 1988 assessed the azure jay as Threatened and since 1994 as Near Threatened. Its population size is not known and is believed to be decreasing. "Agricultural conversion and deforestation for mining and plantation production historically threaten its habitat, with current key threats from urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building."[1] It is considered "frequent to uncommon" in Brazil.[10]
References
[edit]- ^ a b c d e BirdLife International (2023). "Azure Jay Cyanocorax caeruleus". IUCN Red List of Threatened Species. 2023 e.T22705708A224361580. doi:10.2305/IUCN.UK.2023-1.RLTS.T22705708A224361580.en. Retrieved 11 December 2025.
- ^ a b c d e f g h i Brady, S. (2020). Azure Jay (Cyanocorax caeruleus), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.azujay1.01 retrieved December 12, 2025
- ^ a b c d Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (March 2025). "Jayshrike, shrikes, crows, mudnesters, melampittas, Ifrit, birds-of-paradise". IOC World Bird List. v 15.1. Retrieved 9 December 2025.
- ^ a b Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, D. F. Lane, L, N. Naka, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 29 November 2025. Species Lists of Birds for South American Countries and Territories. South American Classification Committee associated with the International Ornithologists' Union. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved November 30, 2025
- ^ Société de naturalistes ed d'agriculteurs (1816). Nouveau dictionnaire d’histoire naturelle, appliquée aux arts, à l’agriculture, à l’économie rurale et domestique, à la médecine, etc (in French). Vol. XXVI. Chez Deterville. pp. 126–127. Retrieved December 11, 2025.
- ^ a b AviList Core Team. 2025. AviList: The Global Avian Checklist, v2025. https://doi.org/10.2173/avilist.v2025 retrieved June 11, 2025
- ^ HBW and BirdLife International (2025). Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 10. Available at: https://datazone.birdlife.org/about-our-science/taxonomy#birdlife-s-taxonomic-checklist retrieved October 12, 2025
- ^ a b Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, M. Smith, and C. L. Wood. 2025. The eBird/Clements checklist of Birds of the World: v2025. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved November 3, 2025
- ^ a b Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, D. F. Lane, L, N. Naka, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 29 November 2025. A classification of the bird species of South America. South American Classification Committee associated with the International Ornithologists' Union. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved November 30, 2025
- ^ a b c d e van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. pp. 388–389. ISBN 978-0-19-530155-7.
- ^ de la Peña, Martín R.; Rumboll, Maurice (2001). Birds of Southern South America and Antarctica. Princeton Illustrated Checklists. New Jersey: Princeton University Press. pp. Plate 81, map 81.16. ISBN 0691090351.
External links
[edit]
- Cyanocorax caeruleus - azure jay specimen(s) in the ZMA
- A lenda da Gralha Azul The legend of the Blue Jay in Portuguese (Internet Archive copy)