All I could find was this: some speculations, but not much.....let's leave that there
Is it an urban/rural thing as much? We live in town now, but live right off a nature/greenway area and have all manner of animals. Fox, pretty sure some coyote, birds, deer, opossum, raccoons, fireflies, etc.....
But, I haven't heard that whippoorwill call in a loooooong time. It's like a dying memory from dusk hours in my childhood.
Anyone else remember hearing these? Anyone still do? Where do you live?