Book excerpt: This pocket-sized field guide identifies plants and animals that live in the intertidal zone of the rocky coast, from Cape Cod north to the Bay of Fundy, in tide pools, caves, and crevices, and on rocks, wharves and pilings. Explains intertidal ecology and how these fascinating and varied creatures--sea slugs, crabs, rockweeds, star fish, and many others--survive in the harsh and ever-changing environment between the limits of high and low tide.