Despite the title, this is not a book about the sloth lemur's song (as Alison Richard admits, we don't even know if this extinct animal did sing), but rather a combination of a story of a personal love for Madagascar with a chronological trip through Madagascar's geological and biological history and prehistory. What shines through here is Richard's deep passion for Madagascar and the book really comes alive when she relates personal experiences. Notable, for example, was the description of a walk involving passing through a location crammed with leeches. We are told that 'By the thousand, they looked like a waving lawn' and a colleague 'pulled 80 leeches off one leg and then stopped counting'. There is lots of good stuff in here, but some parts of the content, notably when dealing with areas outside Richard's own field (for example geology and the history of grasses) didn't truly engage the reader. I also found the structure haphazard - I'm...