The video below was captured on Thursday, February 7, in the American city of Des Plains, Illinois. Local residents were very surprised when they heard strange sounds that day, coming either from somewhere from afar, or directly from the sky. The mysterious noise resembled a rapid intermittent whistle, and the eyewitnesses, no matter how hard they tried, could not find its source. Of course, some impressionable townspeople were afraid that representatives of an extraterrestrial civilization came to Des Plains on their spaceships. The Americans have already sent this video to ufologists so that they carefully study it and express their opinion.
Many users of the World Wide Web claim that the mysterious sounds are similar to the song of frogs, but this theory does not hold water, since amphibians are known to sleep during the height of winter. But maybe they still woke up because of the thaw? Or is it some bizarre acoustic phenomenon? Be that as it may, the unusual entry caught the attention of many users of the World Wide Web, interested in various phenomena and mysteries of nature.