... At the sound of our caravan the red antelope bounded away to our right and the left, and frogs hushed their croak... 
Henry M. Stanley 「How I Found Livingstone」
...He may—and does—get so hoarse that it is a pain to hear him; but as long as he can croak in good volume he is all right...
Stewart Edward White 「African Camp Fires」
..."A low,droning croak...
Frank M. Chapman 「Color Key to North American Birds」
..."Aharsh guttural croak...
Frank M. Chapman 「Color Key to North American Birds」
...When alarmed,a rough, guttural croak...
Frank M. Chapman 「Color Key to North American Birds」
...An abrupt, harsh croak warns theflock that one of their number has discerned a hawk or noticed somethingsuspicious in the air...
John H. Robinson 「Our Domestic Birds」
...And he closed his eyes and gave a hoarse,sad croak...
Abbie Farwell Brown 「The Curious Book of Birds」
...Stork went home to his house, which he set prettily in order: for henever dreamed but that the lady Heron would accept his offer at the veryfirst croak...
Abbie Farwell Brown 「The Curious Book of Birds」
...Stork's shadow darkened the mirrorbefore her, and once more she heard his apologetic croak...
Abbie Farwell Brown 「The Curious Book of Birds」
...Poor Red-Breasted Merganser! Hehas only one note, a croak...
Various 「Birds Illustrated by Color Photography [August, 1897]」
...The call-note is an unmelodious quack or croak...
Rev. C. A. Johns 「British Birds in their Haunts」
...'This has been compared to the scream of the Missel Thrush; butMacgillivray says it seems to him more like the croak of a frog...
Rev. C. A. Johns 「British Birds in their Haunts」
...That shot of yours hit the oldbird in the shoulder; he's scared half to death he'sgoing to croak...
John Charles Beecham 「The Argus Pheasant」
...So obviously is its object to hearten thefemale in her long and patient vigil that assoon as the young are hatched the male'svoice breaks like that of other choristers toa guttural croak...
Frederick G. Aflalo 「Birds in the Calendar」
...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 croak of the crow is, moreover,much harsher than the caw of the rook...
Various 「Natural History in Anecdote」
...Thenthere was a harsh croak...
William J. Long 「Wood Folk at School」
...Then he heard the strangled croak thatKreiss forced from his lips: "Behind you!—look behind you!"...
Charles Willard Diffin 「Brood of the Dark Moon」
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