Mexican Jay

Appearance

The Mexican Jay is a medium-large passerine similar in size to most other jays, with a blue head, blue-gray mantle, blue wings and tail, and pale gray breast and underparts. The sexes are morphologically similar, and juveniles differ only in having less blue coloration and, in some populations, a pink/pale bill that progressively becomes more black with age. Some field guides misreport this color as yellow because the pale bill becomes yellow in museum study skins. The iris is brown and legs are black. It is most readily distinguished from the similar Western Scrub-Jay by the plain throat and breast, and the mantle contrasting less with the head and wings. Its range somewhat overlaps with the Western Scrub-Jays, but, where they co-occur, the two species seem to show ecological and morphological character displacement.

Naming

Note, in May 2011, the American Ornithologists' Union voted to split the Mexican Jay into two species, one retaining the common name Mexican Jay and one called the Transvolcanic Jay.

Reproduction

It has a cooperative breeding system similar to that of the related Florida Scrub-Jay, with several birds helping at a nest; these 'helpers' are usually immature offspring of the dominant pair from the previous 1–2 years, but also include apparently unrelated flock members.

Food

In the winter, the Mexican Jay's diet consists mainly of acorns and pine nuts, which are stored in the autumn. However, they are omnivorous in all seasons and their diet includes a wide variety of plant and animal matter, including invertebrates, small amphibians and reptiles, and birds' eggs and nestlings.