...Call, an explosive quab; song, a soft coo repeatedfour or five times... 
Frank M. Chapman 「Color Key to North American Birds」
...The coo is rapidly repeated, and is continued for several minutes; hence their name of Trumpeters...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Brent, besides its peculiar note, used to coo in a singular and pleasing manner, which, independently, struck both Mr...
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」
...Theoak above my head is a murmurous haunt ofsummer wings, and wood pigeons coo fromthe beeches...
Anonymous 「The Confessions of a Poacher」
...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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