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Between the minute, straight, conical, tit-like beaks of the Laptasthenura a tit in appearance and habits and the extravagantly long, sword-shaped bill of Nasica, or the excessively attenuated, sickle-shaped organ in Xiphorynchus, the divergence is amazing, compared with what is found in other families; while between these two extremes there is a heterogeneous assemblage of birds with beaks like creepers, nuthatches, finches, tyrant-birds, woodpeckers, crows, and even curlews and ibises.
With altered life-habits the numerous divergent forms originated; some, like Xiphorynchus, retaining a probing beak in a wonderfully modified form, attenuated in an extreme degree, and bent like a sickle; others diverging more in the direction of nuthatches and woodpeckers.
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