Very local and often elusive sparrow endemic to the Isthmus of Tehuantepec. Found in brushy woodland and edge of tropical lowlands on Pacific slope. Usually in pairs or small groups, which keep in touch with high, rhythmic twittering choruses. Mostly stays low in brush or on the ground, but sings from atop bushes. Note the subtly distinctive face pattern with double dark whisker stripes, pinkish bottom bill, and long orangish tail.