The Dunwich Horror (H. P. Lovecraft):
"Then too, the natives are mortally afraid of the numerous whippoorwills which grow vocal on warm nights. It is vowed that the birds are psychopomps lying in wait for the souls of the dying, and that they time their eerie cries in unison with the sufferer's struggling breath.
If they can catch the fleeing soul when it leaves the body, they instantly flutter away chittering in daemoniac laughter; but if they fail, they subside gradually into a disappointed silence."
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