This is a great book. It has beautiful illustrations, very clear and helpful. It also has maps on each page showing where the snake lives. One minor problem, it uses a lot of technical terms like "Fossorial" and "Riparian". But (I discovered after my fourth trip to the dictionary) it has a glossary in the back.
However, one major problem. There is no clear indication which snakes are poisonous, which are a little dangerous to humans, and which are harmless. This is a big drawback. I want to know without having to read through the text for a clue if the snake that just entered my tent is going to kill me or not. Some of the time it doesn't tell you even in the text, as in some of the rattlesnakes. Of course, you assume that rattlers are not exactly friendly, but a clear symbol or icon would really help. So would a section letting you know what to do if you've been bitten by a snake.