A great many species are threatened by the expanding human population. Though the public generally favors environmental protection, conservation does not come without sacrifice and cost. Many decision makers wonder if every species is worth the trouble. Of what consequence would the extinction of, say, spotted owls or snail darters be? Are some species expendable?

Given the reality of limited money for conservation efforts, there is a compelling need for scientists to help conservation practitioners set priorities and identify species most in need of urgent attention. Ecology should be capable of providing guidance that goes beyond the obvious impulse to protect economically valuable species (salmon) or aesthetically appealing ones (snow leopards). Although some recent books have considered the ecosystem services provided by biodiversity as an aggregate property, this is the first to focus on the value of particular species. It provides the scientific approaches and analyses available for asking what we can expect from losing (or gaining) species.

The contributors are outstanding ecologists, theoreticians, and evolutionary biologists who gathered for a symposium honoring Robert T. Paine, the community ecologist who experimentally demonstrated that a single predator species can act as a keystone species whose removal dramatically alters entire ecosystem communities. They build on Paine's work here by exploring whether we can identify species that play key roles in ecosystems before they are lost forever. These are some of our finest ecologists asking some of our hardest questions.

They are, in addition to the editors, S.E.B. Abella, G. C. Chang, D. Doak, A. L. Downing, W. T. Edmondson, A. S. Flecker, M. J. Ford, C.D.G. Harley, E. G. Leigh Jr., S. Lubetkin, S. M. Louda, M. Marvier, P. McElhany, B. A. Menge, W. F. Morris, S. Naeem, S. R. Palumbi, A. G. Power, T. A. Rand, R. B. Root, M. Ruckelshaus, J. Ruesink, D. E. Schindler, T. W. Schoener, D. Simberloff, D. A. Spiller, M. J. Wonham, and J. T. Wootton.

Discover secrets, stories and facts about the world's most at-risk animals! This beautifully illustrated collection tells the story of over 60 real-life courageous creatures. With incredible facts about animals from all seven continents and the oceans of the world, from Diego, the age-defying tortoise, to Koko, the beloved gorilla that learned to communicate using sign language. This fascinating book includes tons of information about animal conservation and climate change, making it an ideal read for those who love nature and animals and want to make a difference. Issues covered include: nature and wildlife conservation recycling and reuse eco-preneurs Each chapter is illustrated by artists from around the world, from New Zealand to Brazil. A book to love and treasure, the stunning cover has a shiny gold finish. Rebel Animals is the perfect gift for any animal or nature lover, all year round! Complete your creature collection and discover more amazing animal stories in: Rebel Cats! Brave Tales of Feisty Felines Rebel Dogs! Heroic Tales of Trusty Hounds.

This review of Pennsylvania's conservation efforts is the first book to focus exclusively on the state's vertebrates of concern.

The 133 species of reptiles, amphibians, birds, and mammals discussed in this book are Pennsylvania's most vulnerable terrestrial vertebrates. Each species is described in a full account that details basic biology and includes photographs and range maps. The accompanying narratives focus on conservation priorities, research needs, and management recommendations. Featuring information compiled from a broad array of sources and by contributors who are recognized authorities on their respective species, this volume is a model for wildlife conservation across much of the northeastern United States.

A road map that reveals the Keystone State's most sensitive species and what can be done to manage and conserve these important natural resources, "Terrestrial Vertebrates of Pennsylvania" is a valuable tool for wildlife managers, conservationists, and naturalists.