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Originally, barn swallows built their cup-shaped nests in caves and on cliffs, but they have adapted to the human environment by choosing to build them almost exclusively on man-made structures such as barns and bridges. These aerial foragers can be seen darting gracefully over fields, barnyards, and water as they fly in search of flying insect prey. They are easily identified by their bright cobalt blue feathers, and with a long forked tail that streams out behind them as they glide through the sky. Despite their name, these birds are not true swallows but rather a
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