Both have superb colour photos and plenty of information about each animal. Equally important they are both slim enough and light enough to slip into your pocket or backpack without being weighed down.
At least one of the contributors (Gehan De Silva Wijeyeratne) is a highly respected author on animals in the wild (search Google for some articles he's written). He runs an eco-travel company and has reported on the natural flora and fauna around the world. It was his unusual name that stuck in my mind when I found his book on Amazon.
I'll be using this book in March/April 2013 and I'll certainly try and report book on the books' usefulness.
In the meantime it's time for some highly absorbing reading...