Mexican Jay
Aphelocoma wollweberi
The Mexican jay is a medium-large (~120 g) 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 (instead of black) bill that progressively becomes more black with age (Brown and Horvath 1989). 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.
ID text from Wikipedia, CC BY-SA 4.0
Woodhouse's Scrub Jay
Aphelocoma woodhouseii
Woodhouse's scrub jay is a medium-sized bird, approximately 27–31 cm (11–12 in) in length (including its tail), with a 39 cm (15 in) wingspan, and about 80 g (2.8 oz) in weight. The species has a blue head, wings, and tail; a gray-brown back; and grayish underparts. The throat is whitish with a partial blue breast band ("necklace"). The call is described as "harsh and scratchy". Compared to the California scrub jay, Woodhouse's has a duller blue, darker gray underparts, a less distinct blue necklace, and a straighter bill.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Mexican Jay and Woodhouse's Scrub Jay.