Black-chested Jay
Cyanocorax affinis
Measuring 34 cm (13 in) long, this jay is easily recognized from its distinctive facial pattern and yellow eye. The head, face, and chest are mostly black with violet-blue spots above and below the eye, as well as a violet-blue malar stripe. The underparts are white as is the tip of the tail, while the upperparts and wings are mainly dark violet-blue. It does not exhibit sexual dimorphism.
ID text from Wikipedia, CC BY-SA 4.0
Brown Jay
Cyanocorax morio
Brown jays vary in plumage geographically: there are two main groups. Northern birds are almost completely dark brown, with lighter brown on the underparts. Southern birds are white-bellied and have bright white tips to the outer tail feathers. The intergrade zone is in Veracruz, Mexico. Adults in both populations have black bills, legs, and feet. Immatures have yellow bare parts, including yellow eye-rings. The voice is a loud but low-pitched pee-ah call and is often modified to suit its situation or mood.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black-chested Jay and Brown Jay.