...I got out and climbed on the top of therock, but all was still save for the gentle lap of the tide and the croak ofsome night bird among the crags... 
John Buchan 「Mr. Standfast」
...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 hoarse croak...
Frank M. Chapman 「Color Key to North American Birds」
...A rasping, clattering croak,uttered when fighting or in coming to the nest...
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」
...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」
...Poor Red-Breasted Merganser! Hehas only one note, a croak...
Various 「Birds Illustrated by Color Photography [August, 1897]」
...He is so persistent in hissinging, however, that the Red-BreastedMerganser’s simple croak would sometimesbe preferable to it...
Various 「Birds Illustrated by Color Photography [August, 1897]」
...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]」
...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」
...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」
..."The call is a prolonged, raspy, staccato croak, sometimes with arising inflection at the end...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...“It’s some kind of big frog or toad: they live in such marshy places as this, and they croak and make noises that seem to be ever so far-off, when they are close by...
George Manville Fenn 「Off to the Wilds」
...Thenthere was a harsh croak...
William J. Long 「Wood Folk at School」
...He wanted to tell her to go back—the amoeba was only feet away—buthe could only manage a little croak...
Various 「Astounding Stories, April, 1931」
...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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