...trinar, to trill... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...To describe its song as severalwheezy notes running into a little trill, conveys no idea ofpleasing character...
Frank M. Chapman 「What Bird is That?」
...Its song is a trill, clear and sweet, but by no meansloud...
Frank M. Chapman 「What Bird is That?」
...Beforeeven the robin was awake, earlier than dawn, he would start themorning chorus with the simple little trill that answers for a song toexpress every emotion throughout the long day...
Neltje Blanchan 「Birds Every Child Should Know」
...Call, a recognizablechip; song, a short, simple trill...
Frank M. Chapman 「Color Key to North American Birds」
...Call, a scolding cack; song likeRed-eye's but richer, more deliberate, see me; I'm here;where are you? in varying forms; also a mellow trill...
Frank M. Chapman 「Color Key to North American Birds」
...Its proper songis full, loud, clear, and powerful, rapidly executed and terminatingin a trill or shake, followed by two or three unimportant notes...
Rev. C. A. Johns 「British Birds in their Haunts」
...Then he took up the real music lessons, and taught him how to whistleand how to warble and trill...
Gene Stratton-Porter 「The Song of the Cardinal」
...The upland plover wailshis greeting to the tussocked pastures,where day and night rings the shrillchorus of the hylas and the trill of thetoads continually trembles in the softair...
Rowland E. Robinson 「In New England Fields and Woods」
...Thecall is a high-pitched insect-like trill...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The call is a quiet low trill or series of staccato whistles risingslightly at the beginning; a short peeplike note also was heard...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...Then I discovered thatthere is a trill, a tiny grace note or yodel, at the end of his secondnote...
William J Long 「Wilderness Ways」
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