Wave-Swept Shore by Mimi Koehl is one of those books that people flip through, looking at pictures and maybe reading a few captions. You should sit down and read the whole thing.
This book takes a very up-close look at an environment that most people may not know even exists. Of those that do know it exists, most probably don't realize the complexity of the micro-habitats and the creatures that inhabit them. Koehl discusses the forces of nature that these organisms must deal with on a daily basis and the adaptations they have that make life on the edge possible.
The text is supported by some pretty amazing pictures by Anne Wertheim Rosenfeld. How they got some of these shots despite the waves pounding around them, I don't know. My four-year old had a fun time playing where's the starfish (a common creature in these pictures).
The only problem with this book is that it really made me miss the beach. I think it's time for a visit!