Considered the "Bible of Conservation Volunteering," Green Volunteers highlights hundreds of volunteer projects throughout the world. Green Volunteers lists more than two hundred projects worldwide for those who want to experience active conservation work as a volunteer. Projects are in a variety of habitats and countries, lasting from one week to one year or more. Projects involve volunteer work in wildlife rehabilitation centers, national parks, and protected areas, and general conservation work with a variety of animal species. The guide has three indexes set up by geographical area, animal species, and project cost, all to help prospective volunteers choose their favorite conservation project. Almost all the projects are open to anyone without previous conservation experience, and most projects do not have language requirements. The Green Volunteers guide is a onetime purchase. Anyone who purchases the guide can receive free updates via the internet, plus an extended annotated list of useful websites that allow the reader to find hundreds of additional projects.