The Barn Swallow is a graceful, agile aerial insectivore measuring 15–19 cm (including the elongated tail streamers), world-renowned for its deeply forked tail with white subterminal windows. It features steely glossy-blue upperparts, a deep chestnut-rufous forehead and chin bordered by a prominent dark blue breast band, and clean off-white to buff-washed underparts. Exceptionally swift and buoyant on the wing, it glides low over open riverbeds, terraced cultivation, pastoral grasslands, and lakes, capturing flying midges, beetles, and flies on the wing or drinking by skimming surface waters. In Himachal Pradesh and the wider western Himalayas, it is a widespread summer breeding migrant and passage migrant, nesting as solitary pairs or loose colonies under traditional wooden eaves, culverts, bridges, and mountain homesteads from the lower valleys up to 3,000 meters elevation.