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Aa very similar in habits \\ 
and general appearance to the swallow 
and the martins, this bird can easily be distinguished from 
them by its larger size, its smaller tail, and the sharp 
backward curve of its sickle-shaped wings. Its flight is 
very much more rapid than theirs, and is kept up without 
intermission from earliest dawn until so late in the evening 
that it is almost impossible to see the bird as it sweeps by. 
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