Barn swallows are small birds. They are 14.6 to 19.9 cm long and have a wingspan of 31.8 to 34.3 cm. They weigh between 17 and 20 g. Barn swallows are metallic blue-black above and pale beige below. They have light brown on their throat and forehead, and have a long, deeply-forked tail. Males and females look very similar. However, females tend to be less brightly colored and have shorter tails.
Range mass: 17 to 20 g.
Range length: 14.6 to 19.9 cm.
Range wingspan: 31.8 to 34.3 cm.
Other Physical Features: endothermic ; bilateral symmetry ; polymorphic
Sexual Dimorphism: male larger; male more colorful
Average basal metabolic rate: 0.3158 W.
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