Transvolcanic Jay
Aphelocoma ultramarina
The Transvolcanic jay is 28 to 32 cm (11 to 13 in) long and weighs 120 to 150 g (4.2 to 5.3 oz). The sexes have the same plumage though males are slightly larger than females. Adults of the nominate subspecies have a mostly dark bluish head with black lores and a pale grayish throat. Their upperparts are bluish purple and their underparts dingy grayish white that is lightest on the undertail coverts. Subspecies A. u. colimae is slightly smaller than the nominate and paler overall with less purplish on its upperparts. Voice: The Transvolcanic jay's voice is very similar to that of the Mexican jay, and is described as "an upslurred grating call note, repeated singly, doubled or in series". The grating appears to decrease from the beginning to the end of each note.
ID text from Wikipedia, CC BY-SA 4.0
Unicolored Jay
Aphelocoma unicolor
The unicolored jay is about 34 cm (13 in) long. The nominate subspecies A. u. unicolor weighs about 125 to 150 g (4.4 to 5.3 oz). The sexes have the same plumage. The nominate subspecies is entirely deep blue to purplish blue that is somewhat darker on the sides of the head and the throat. Juveniles are a slightly bluish gray that is duller than adult plumage. Subspecies A. u. griscomi has the same plumage as the nominate. A. u. guerrerensis is the most purplish subspecies, A. u. concolor is a paler blue than the nominate, and A. u. oaxacae is somewhat darker than the nominate. Voice: Though recordings of unicolored jay vocalizations come from most of its range, detailed analyses come primarily from the Montebello studies. The birds there made hundreds of variants of their calls though many were only subtly different from each other. The calls were described as grating/harsh, musical/resonant, whistled, loud, and soft.
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: Transvolcanic Jay and Unicolored Jay.