I’ve just finished this book. Rather than re-type my Goodreads review I am sharing that below for those who don’t have access to that site.
With regard to the ornithological comments, as the detail of this would sit better in this blog it included from memory a statement that terns winter in Northern Europe and several references to calls as song. But overall as someone visiting remote Shetland islands annually since 2007 I found it well written and rewarding, and it taught me a lot about Shetland ponies and the people who care for them.
I’ve already found a deserving home for my copy so my customary offer of lending it out doesn’t apply this time.