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This is a Social Flycatcher. Differentiated from the similar Great Kiskadee by the yellow extending up to the throat instead of fading.
Not sure on the species. Common Yellowthroat is actually several species and are also just called Yellowthroats. Wikipedia has a small species ID card. http://www.eol.org/pages/1051322 has a bit more details, but the pictures are a bit overlapping. Mexico has a year-round range for this bird.