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Today we crossed the Mexican ‘waistline’ of the Isthmus of Tehuantepec, a significant geographic barrier that has encouraged speciation, and created a distinct division in avifaunas in
Later in the day we walked up a wet drainage on the Isthmus itself in the foothills around Arriaga, and pretty quickly Michael worked his magic with a couple of smart-dressed Rosita’s Buntings (see top photo), including a pink-and-rose male, resplendent in breeding dress. Also there was the endemic Green-fronted Hummingbird. We closed the day close to Mapastapec in
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