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The swallows and martins have an evolutionarily conservative body shape which is similar across the clade but is unlike that of other passerines. Swallows have adapted to hunting insects on the wing by developing a slender, streamlined body and long pointed wings, which allow great manoeuvrability and endurance, as well as frequent periods of gliding. Their body shape allows for very efficient flight, which costs 50–75% less for swallows than equivalent passerines of the same size.
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