...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.」
...Some races are very silent; others coo in a highly peculiar manner...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...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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