San Blas Jay

The San Blas jay, a member of the Corvidae family, is a striking bird endemic to Mexico. Adults measure between 27 and 35 cm in length and weigh from 92 to 122 grams. Both sexes exhibit a similar plumage with a vivid blue back, rump, wings, and tail, while the rest of their feathers are a deep black. A notable feature is the small crest adorning the front of their head. Their bill and legs are black, and they have distinctive white irises.

Identification Tips

When identifying the San Blas jay, look for the combination of black and blue plumage, the small crest on the head, and the white irises. Juveniles can be distinguished by their larger crest, yellow bill, and brown eyes.

Habitat

The San Blas jay is found in a variety of environments including dry and semi-moist woodlands, thickets, groves, plantations, and even mangrove areas. However, they tend to avoid the deeper parts of the forest.

Distribution

This species is exclusively found in Mexico, with two subspecies: C. s. nelsoni inhabits southwestern Mexico from Nayarit to western Guerrero, while C. s. sanblasianus resides along the coastal region of Guerrero.

Behaviour

San Blas jays are sociable birds, living in small groups that can number up to thirty individuals, including six to ten breeding pairs. They maintain large territories and exhibit minimal interaction with neighboring groups. Stable pair bonds are common, and most individuals begin breeding at the age of three.

Breeding

Nests are constructed socially in trees, vines, or shrubs, often in palm tree crowns. Made of twigs and lined with soft plant material, they house clutches of up to four mottled eggs. Incubation, which lasts about eighteen days, is sometimes briefly assisted by non-breeding females. Both parents, along with several other birds, may help feed the chicks, particularly after fledging.

Diet and Feeding

The San Blas jay is an omnivore, foraging both on the ground and in the lower parts of trees. Its diet includes insects, other invertebrates, fruit, and small vertebrates like lizards. They have also been observed preying on the nestlings of other bird species, such as the ruddy ground dove.

Conservation status

The IUCN has classified the San Blas jay as "Least Concern," indicating that, at present, there are no significant threats to its population.