It was great to see an information book with this kind of engaging story line. The search for the fungus, and the story after its discovery were interesting to follow, and scientific process and scientists at work were foregrounded by Markle instead of just presenting basic facts--almost like a crime procedural. This is vital for the survival of the printed informational picturebook. There will be thousands of titles in the future that go only to ebook format, because unless a book does something more like this one does with the narrative, then it will be hard for publishers to justify the cost of going to paper and boards.
Sources: I wished Markle and her editors had put the acknowledgments in the back matter and clearly discussed how thoroughly involved she has been with the scientists and volunteers behind this inquiry. The small fine print should be larger and have some more explanation about who the people are. This was very credible sourcing, and should be vindicated more in print. I would have preferred sourcing to the index or glossary if it came down to a choice.