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About 30cm from beak to tail, with almost half of that being the tail. Gregarious with a very distinctive call.
Spotted in Mexico City as well as other urban areas in Mexico.
If it is what I think it is it's a Great-tailed Grackle or Mexican Grackle (Quiscalus mexicanus) They call them "cuervo". When I was in Mexico I kept asking them what they were called because they were so different then our US black birds