The barn swallow (Hirundo rustica) is the most widespread species of swallow in the world. It is a distinctive passerine bird with blue upperparts and a long, deeply forked tail. It is found in Europe, Asia, Africa and the Americas.
Length : The adult male barn swallow of the nominate subspecies H. r. rustica is 17–19 cm (6.7–7.5 in) long including 2–7 cm (0.79–2.76 in) of elongated outer tail feathers.
Wingspan: It has a wingspan of 32–34.5 cm (12.6–13.6 in)
Weight : weighs 16–22 g (0.56–0.78 oz).
Population : around 190 million
Habitat: The preferred habitat of the barn swallow is open country with low vegetation, such as pasture, meadows and farmland, preferably with nearby water.
Diet: flying insects