The Barn Swallow is a small bird easily recognized by its steely-blue upper-parts, cinnamon under-parts, chestnut throat and forehead, and deeply forked tail. Both sexes have similar plumage, but males have longer outer tail streamers than females and tend to be darker chestnut on their under-parts.
Barn Swallows can be easily distinguished from other swallows by their deeply forked tail with long outer tail streamers.
Weight: 17 to 21 g (0.6 to 0.7 oz). Length: 15 to 18 cm (5.9 to 7.1 in).