...He steadily declined, and whetted his knife, his eyes gleaming with delight, his lips crooning one of his weird Monumwezi songs... 
Stewart Edward White 「African Camp Fires」
... crooning again the soft syllables which she has spoken ever since...
Abbie Farwell Brown 「The Curious Book of Birds」
...The king-crows are feeding theiryoung ones in the greenwood tree, and crooning softly to thempitchu-wee...
Douglas Dewar 「A Bird Calendar for Northern India」
...We could hear the birds crooning and cooing in alldirections as we rode, “like the moan of doves in immemorial elms,and the murmurings of innumerable bees...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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