...Still again, in the case of the blackbird,which has a considerable variety in its language,there is one little chirp familiar to every one—asmall round drop of sound of a musical, bell-likecharacter... 
W. H. Hudson 「Birds and Man」
...Not the chirp of a bird broke the silence...
James Oliver Curwood 「Baree, Son of Kazan」
...The note of the nestling is a shrill plaintive chirp,which may best be imitated by twisting a glass stopper in a bottle...
Rev. C. A. Johns 「British Birds in their Haunts」
...The Chaffinches chirp their rallyingcry:...
J. H. Fabre 「The Wonders of Instinct」
...Of insect life one hearslittle but the mellow drone of the bumblebee,the noontide chirp of the cricket,and the husky rustle of the dragonfly'sgauzy wing...
Rowland E. Robinson 「In New England Fields and Woods」
... the lazy chirp of crickets...
Rowland E. Robinson 「In New England Fields and Woods」
...The keen ears detect every faintest chirp,or rustle, or scratching of tiny claws on the roost...
William J. Long 「Ways of Wood Folk」
...When called by name he would always answerwith a special chirp and look up expectantly,either to receive something or to be let out...
Elizabeth Brightwen 「Wild Nature Won By Kindness」
...Blackbirds and bluebirds chatter andchipmunks chirp...
Various 「Astounding Stories of Super-Science April 1930」
...On mywhistling to them, one whistled some beautifully varied notes, as soft asthose of an octave flute, although their common chirp was harsh anddissonant...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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