...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」
...Calla sharp tsip, frequently uttered; song, a weak, musicallittle trill following a grasshopperlike introduction,tsip, tsip, tsip, sē-e-e-s'r-r-r...
Frank M. Chapman 「Color Key to North American Birds」
...Call,scolding, a characteristic Wren-like cacking; song, areedy, guttural, bubbling trill often sung in flight...
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]」
...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」
...The mating call ofHyla foliamortaconsists of one pulsed, low-pitched, moderate trill of about O...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
...I soon learned to distinguish him easily; his cap was verybright, and his white cravat very full, and his song never stopped atthe second note, for he had mastered the trill perfectly...
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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