Birds that ‘speak’ with a flap of their wings have regional dialects

Male fork-tailed flycatchers have a notch in their wings that makes a high-pitched sound as they fly, and birds from different areas produce different pitches – a bit like a regional dialect

Source:
https://www.newscientist.com/article/2255046-birds-that-speak-with-a-flap-of-their-wings-have-regional-dialects/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home