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. 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 20 g (0.6 to 0.7 oz). Length: 15 to 18 cm (5.9 to 7.1 in).