Blue rook in the Rio de Janeiro's zoo, Brazil.

The Azure Jay, (Cyanocorax caeruleus) (Brazilian Portuguese: Gralha-azul) is a passeriform bird of the crow family Corvidae, with blue feathers on the head, on the front part of the neck and on the upper chest. Males and females have the same plumage and appearance although the females in are typically smaller.

It lives in the Araucaria angustifolia forests in the south of Brazil, where it feeds on insects and fruit. However, it ranges more widely, and its distribution ranges from the State of S??o Paulo to the State of Rio Grande do Sul, being frequent in the Atlantic forests. It is the state bird of Paran??.

Azure Jays are very intelligent birds. Its communication is quite complex, consisting of at least 14 different vocalizations. They are gregarious, forming groups of 4 to 15 individuals with a very organized hierarchy, being divided into clans, groups that stay stable for up to two generations.