There are many reasons why a book might be unavailable.
Sometimes a book goes temporarily out of print - and sometimes no audio version has ever been recorded. Audible wants to give you the most complete selection we can and we'll keep adding series and filling in gaps as quickly as possible.
Very nice mystery book must read. Interesting ending part of the fun jungle series must read!!!!!!!!!!!?
Really cool story and wildlife facts. Whole family enjoyed the book on a road trip.