Mexican Jay or Pinyon Jay?

Here's how to tell the difference

Mexican Jay image 1

Mexican Jay

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Pinyon Jay image 1
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Pinyon Jay

Mexican Jay

Aphelocoma wollweberi

General appearance

The Mexican jay is a medium-sized bird with a long tail and a robust bill. Its plumage is predominantly a striking blue, with lighter shades on its head, nape, and wings. The throat and underparts are pale grayish-white, providing a noticeable contrast to the deeper blue hues of its back and tail.

Male vs female

There is little to no sexual dimorphism in the Mexican jay, meaning males and females appear similar. Both genders exhibit the same vivid blue and gray coloration, making visual differentiation between sexes difficult in the field.

Juvenile

Juvenile Mexican jays are duller in color compared to adults, with more muted blue tones and a slightly browner overall appearance. Their underparts are also grayer rather than the crisp white seen in adults, and their bills and legs appear lighter.

Size

11.0 - 12.6 in/3.5 - 4.8 oz

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How to tell the Mexican Jay from the Pinyon Jay

Visual differences

The Mexican Jay is larger (11-12.5 inches) with a robust bill and a striking blue body contrasting with pale grayish-white underparts. In contrast, the Pinyon Jay is slightly smaller (10-11.5 inches), stocky, with a short tail and a spike-like bill. It has a uniform dull blue coloration. Mexican Jays' blue is more vibrant with distinct color variations, while Pinyon Jays display a uniform, muted coloration. The Mexican Jay's tail is longer, contrasting with the Pinyon Jay's short, square-tipped tail.

Key differences and behavior

Mexican Jays and Pinyon Jays showcase distinct behavioral characteristics in their natural habitats. Mexican Jays typically form family groups up to 25, living in oak-pine woodlands, primarily in Arizona and Texas, while Pinyon Jays create larger flocks up to 500, inhabiting pinyon-juniper woodlands. Mexican Jays are cooperative breeders, with flocks contributing to feeding young, and nest in trees like oaks or pines, whereas Pinyon Jays engage in competitive courtship and nest colonially in junipers or pinyons. Diet-wise, Mexican Jays shift seasonally between acorns, pine seeds, and insects, while Pinyon Jays focus on pinyon seeds but also consume other seeds and insects, known for caching large quantities. Both may visit feeders, favoring seeds and nuts. Size-wise, Mexican Jays are slightly larger, 11-13 inches, versus Pinyon Jays' 10-11 inches.

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