...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」
...Call, a characteristictchip; song, a 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」
...Call,chip; song, a musical whistle, cher-weé, cher-weé-cher-weé,cheé-o, dee-e-e-e-e; with many variations but usually endingin a 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」
...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]」
...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」
...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 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 slow trill, in which theindividual notes are discernible...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...Then I discovered thatthere is a trill, a tiny grace note or yodel, at the end of his secondnote...
William J Long 「Wilderness Ways」
...Killooleet was singing, cheery as ever; but my ownheart gave a minor chord of sadness to his trill that was not therewhen he sang on my ridgepole...
William J Long 「Wilderness Ways」
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