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Hudson suggests that this bird lost the nest-making instinct by acquiring the semi-parasitical habit, common to many South American birds, of breeding in the large covered nests of the Dendrocolaptidæ, although, owing to increased severity in the struggle for the possession of such nests, this habit was defeated. P. L. Sclater and W. H. Hudson, Argentine Ornithology, 1888, vol. i. pp. 72-86.
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