This work offers an introduction to the biology of the unique organisms that inhabit rocky coastal ecosystems. Using examples from all over the world, the book serves as an ideal resource for instruction, either in the field or lecture hall. It describes the physical factors that affect organisms, the biology of the animals and plants that live on the shore, the factors that control them, and the communities they form. The authors provide examples of observations and experiments that can be conducted either in the lab, or on-site. They also address key problems of pollution and conservation in the context of their effects on biodiversity. The work will interest all students of marine biology, along with professional marine biologists and amateur naturalists.