...“Must thou croak from every rock we rest on?” ... 
Talbot Mundy 「King--of the Khyber Rifles」
... 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」
...A hoarse croak...
Frank M. Chapman 「Color Key to North American Birds」
..."A low,droning croak...
Frank M. Chapman 「Color Key to North American Birds」
..."A hoarse croak, like a small editionof that of the Red-breasted Merganser...
Frank M. Chapman 「Color Key to North American Birds」
..."Aharsh 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」
... ending with a little internal sound or croak...
W. H. Hudson 「Birds in Town and Village」
...And he closed his eyes and gave a hoarse,sad croak...
Abbie Farwell Brown 「The Curious Book of Birds」
...The Turkey Vulture is a very silentbird, only uttering a hiss of defianceor warning to its neighbors when feeding,or a low gutteral croak of alarmwhen flying low overhead...
Various 「Birds Illustrated by Color Photography [August, 1897]」
...The smell ofdeath is so grateful to them that they utter a loud croak of satisfactioninstantly on perceiving it...
Rev. C. A. Johns 「British Birds in their Haunts」
...From the cry croak the Raven no doubt derives itsLatin name Corvus the French Corbeau, and its common Scotchappellation Corbie...
Rev. C. A. Johns 「British Birds in their Haunts」
...In musical capabilitiesit is inferior even to its relative, its solitary croak beingneither so loud nor so clear...
Rev. C. A. Johns 「British Birds in their Haunts」
...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」
...They now have a call-note, though before they have beenquite mute; it is said by some to resemble the syllables pitt-pitt-coor,by others to be very 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」
...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」
...These noises, so like the croak of bullfrogs but magnified a thousandtimes, were terrifying to the heart...
Various 「Astounding Stories of Super-Science, June, 1930」
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