...trinar, to trill... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...“They ain’t quite so bad when they get big enough to trill, but that everlasting yipping makes me lonesome...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...They arealmost exclusively found in pinewoods, either light or heavygrowth, where they can alwaysbe located by their peculiar, musicallisping trill...
Chester A. Reed 「The Bird Book」
...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」
...Only a bird! and the tiny throat With quaver and trill and whistle of fluteBruised and bleeding and silent lies There at his feet...
Various 「Birds Illustrated by Color Photography [February, 1898]」
...Saunders (1951:257-258) describes this song as short, and buzzlike, beginning with two or three short, rather faint notes and ending in a trill at first loud but fading away toward the end...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
...This note is usually higher than the final trill and connected with it...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
...All around, from the drift of floating andstranded water weeds, arises the dry,crackling croak of frogs, and from sunnypools the vibrant trill of toads...
Rowland E. Robinson 「In New England Fields and Woods」
...The call is a slow trill, in which theindividual notes are discernible...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...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」
...There was the trill of a canary withthe sun on its cage...
Various 「Astounding Stories of Super-Science February 1930」
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