...In the evening hush could be heard the buzzing of insects and the croaking of the frogs... 
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...At length the shouting ceased, when the doctor began to shriek, making his voice sound like the croaking of a whole flock of birds of prey about to descend on a dead carcase...
W.H.G. Kingston 「The Two Supercargoes」
...A croaking, wheezy whistle, like the sound of a cart wheel thatneeds axle-grease, expresses whatever pleasure they may have in life...
Neltje Blanchan 「Birds Every Child Should Know」
...A hoarse, croaking, craack-craack, sometimes adeep, grunting koeer-koeer; a clucking, and a metallicklunk...
Frank M. Chapman 「Color Key to North American Birds」
...Lastly, when not croaking amid the foliage, the tree frogs indulge in the most graceful dives...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...As the otter, inquisitively followingthe line of the scent, came to the ponds,she heard the croaking of countless frogshidden in the duckweed that lay over theentire surface of the water...
Alfred W. Rees 「Creatures of the Night」
...Goodfellow,the harsh croaking call of the Greater Bird of Paradise,which is heard almost daily in the jungle...
A. F. R. Wollaston 「Pygmies and Papuans」
...A croaking cry came from oneand as another raised his tube-and-handle, something flicked from itthat burst close beside Norman...
Various 「Astounding Stories of Super-Science, August 1930」
...The last stair—the roof-openingabove; and then from beneath a great croaking cry swelled instantlyinto chorus of a alarmed shouts...
Various 「Astounding Stories of Super-Science, August 1930」
...These noisy birds(Plyctolophus Leadbeaterii) kept incessantly screeching to their young,which answered them in notes that resembled the croaking of frogs, morethan anything else...
Charles Sturt 「Expedition into Central Australia」
...We no longer heard the discordant shriek ofthe parrots, or the hoarse croaking note of the bittern...
Charles Sturt 「Expedition into Central Australia」
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