… those were pterodactyl soaring with cavernous gray wings, gigantic bats of delirium and night fever. (A sound of Thunder)
What flew in the sky?
It seems like you've mentioned a line from the short story "A Sound of Thunder" by Ray Bradbury. This line describes the image of creatures flying with large gray wings, resembling pterodactyls or enormous bats. The story involves time travel, so these creatures might have come from the prehistoric past to the present.
If you have any specific questions or if there's something you would like me to explain further, please let me know!