...Its call is a crooning coo... 
Frank M. Chapman 「What Bird is That?」
...Some races are very silent; others coo in a highly peculiar manner...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In spring the male utters a note not unlike the coo of aWood-pigeon, which it repeats several times, and at other seasons itoccasionally emits a sound something like the shrill note of the Greenfinch...
Rev. C. A. Johns 「British Birds in their Haunts」
... "Coo Cher! Coo Cher!" imitated the Cardinal...
Gene Stratton-Porter 「The Song of the Cardinal」
...The note of this dove is exceedinglyplaintive, and is softer, but much resembles the coo of the turtle-dove...
Charles Sturt 「Expedition into Central Australia」
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