The center of the Blue-tufted Starthroat’s distribution is in south-central South America, in Bolivia, Paraguay, northern Argentina, and southern Brazil, with apparently highly anomalous records in southeast Colombia and eastern Ecuador. Fully adult males are unmistakable birds; green above, with a crimson throat patch, and deep blue below with elongated neck feathers. The tail is forked and the straight bill unusually long. Females share the long bill and largely green upperparts, but are largely off-white below, with a coppery sheen to the neck. The Blue-tufted Starthroat prefers grasslands and lightly wooded areas, including forest borders, and typically assumes a rather prominent perch, sometimes high above the ground.