I'm currently reading Where Song Began[1] which discusses this, and is super-interesting besides. Has an anecdote of WW1 pilots encountering flocks of dozing sw

I'm currently reading Where Song Began[1] which discusses this, and is super-interesting besides. Has an anecdote of WW1 pilots encountering flocks of dozing swallows at night. 1. https://www.amazon.com.au/Where-Song-Began-Australias-Changed-ebook/dp/B00KYDSKXW https://www.amazon.com.au/Where-Song-Began-Australias-Change...