Ivory, Horn and Blood

I think this book is an excellent crash course in the elephant and rhino poaching crisis. It's a tiny bit dated now, unfortunately, just 5 years after being published. So much has happened in that short period of time, and it's important to look up more recent information as you go. For example, the last male Northern White Rhino passed away not long ago, so the section that discusses problems with inbreeding for the remaining seven NWRs is, sadly, irrelevant now.