Nhạn bụng trắng- Barn Swallow Hirundo rustica, Nghĩa Hưng, Nam Định, Feb 2017

The adult male barn swallow has steel blue upperparts and a rufous forehead, chin and throat, which are separated from the off-white underparts by a broad dark blue breast band. The outer tail feathers are elongated, giving the distinctive deeply forked “swallow tail”. There is a line of white spots across the outer end of the upper tail. The female is similar in appearance to the male, but the tail streamers are shorter, the blue of the upperparts and breast band is less glossy, and the underparts paler.

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