5. When and why do chimney swifts twitter?
2. Birds and Their Sounds
Birds without a song just call
From page 13 in the book.
When and why do chimney swifts twitter? Just when do chimney swifts twitter? When they are flying all alone, or flying with others, or when they meet other swifts on a flyby? Learning when they call will provide hints as to why they call. As with so many explorations I suggest in this book, you are on your own, as I can find no evidence that anyone has been curious enough to ask, much less answer, these simple questions of chimney swifts.