"The Screaming Sky -- in pursuit of swifts" by Charles Foster - NOT amateur radio

This book, loaned to me by my son, is about the lives of swifts.  Reading it makes you realise they are only here for a few months, with their real home in Africa. Funny, I always await the joyous return of the swifts every spring.

 See https://www.rspb.org.uk/birds-and-wildlife/swift .