...They chirrup brisklyfor food: the dam gives most, while the redbreasted cock gives one ortwo, and then knocks the rest away... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...It utters a cheerful chirrup...
Douglas Dewar 「Birds of the Indian Hills」
...As I moved away, the parent birdhopped about uneasily in a neighbouring tree, uttering its monotonousand unmusical chirrup, but molested me no further...
Rev. C. A. Johns 「British Birds in their Haunts」
...We have not seen a bird, nor heard the chirrup of any to disturbthe gloomy silence of the dark and dismal forest—thus plainly indicatingthe absence of water in and about this country...
John McDouall Stuart 「Explorations in Australia, The Journals of John McDouall Stuart」
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