They passed directly over me so that I had them a long time in sight, the kestrel travelling quietly on in the face of the wind, the crow toiling after, and at intervals spurting till he got near enough to hurl himself at his enemy, emitting his croaks of rage.
"Afoot in England"
W.H. Hudson
Lying flat to watch the grass and shrub tops against the stars, he gave the frog croaks arranged, at intervals of ten seconds.
"Witch-Doctors"
Charles Beadle
"Let up on the croaks," Peter spoke abruptly.
"The Come Back"
Carolyn Wells