Mexican Jay

The Mexican Jay ranges through oak and pine-oak woodland canyons of the southwestern United States and much of Mexico's highlands, where it lives in stable, long-term social groups. It closely resembles other Aphelocoma scrub-jays in its blue-and-grey coloring but generally lacks the distinct breast necklace band shown by species like the Woodhouse's Scrub-Jay, giving it a plainer, more uniformly pale underside.

It is well studied for its complex cooperative social system, with groups persisting across many years and generations.

• Head, wing, and tail feathers are blue, without a crest, giving a smooth-crowned profile typical of scrub-jays
• Back feathers are pale grey, generally paler and less brown-toned than in some related scrub-jay species
• Underparts feathers are pale grey with little to no contrasting breast band, a useful distinction from species like the Woodhouse's Scrub-Jay that show a more defined necklace marking
• Throat feathers are only faintly paler than the breast, lacking sharp contrast

Sexes look alike in plumage. Juveniles show duller, grayer-blue feathering on the head and wings that brightens with maturity through successive molts. One complete molt occurs annually in adults after breeding.

• Found in the mountains of the southwestern United States, including parts of Arizona and New Mexico, extending south through much of the Mexican highlands
• Favors oak and pine-oak woodland in canyons and foothill mountain ranges
• Non-migratory, with stable social groups occupying the same territory across many years

Mexican Jays live in large, stable social groups that persist across multiple years, with related and unrelated birds cooperating to raise young and defend territory. They cache acorns extensively, an important food source in oak woodland, and forage both on the ground and in trees for insects and small animals as well. Calls include a variety of harsh, querulous notes used for group coordination, and nests are built in oak or pine trees within group territories.