Wolf howls may have served as a danger signal to our ancestors – and modern emergency sirens may be an effective way to alert us because they sound like howls
Source:
https://www.newscientist.com/article/2254705-sound-analysis-hints-sirens-have-an-evolutionary-link-with-wolf-howls/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home