These groups are listed under several categories; some are listed in more than one category. Where the group's location isn't obvious from their name, we give the region where the group is involved. Groups generally working on national or international scales are listed first in each category.

This list is not complete. We hope to add groups to it as we become aware of their work. If you would like to be listed in this directory, please send us your website address and a sentence or two describing what you do. The decision to list groups rests solely with The Rewilding Institute. If you no longer wish to be listed or your mission has changed, please let us know.

• Southern Plains Land Trust The Southern Plains Land Trust (SPLT) was founded in 1998 with the goal of creating a network of prairie wildlife refuges. We’ve been at it ever since. In the last several years, SPLT has dramatically increased our pace of land acquisition because more refuge is needed to ensure the future of the native animals and plants that make the Southern Plains, and southeastern Colorado in particular, a biodiversity hotspot. We draw inspiration from best-selling historian Dan Flores’ vision of an American Serengeti. 
• Campaign for America's Wilderness The Campaign for America's Wilderness is a national effort to permanently protect the nation's last wild lands by placing them into the National Wilderness Preservation System, where they will remain in a natural state for the use and enjoyment of future generations.
• Arizona Wilderness Coalition The AWC focuses exclusively on roadless and wildland protections, including advocating for wilderness and wild and scenic river designations.
• New Mexico Wilderness Alliance The New Mexico Wilderness Alliance is a grassroots environmental organization dedicated to the protection, restoration and continued enjoyment of New Mexico's wildlands and Wilderness Areas.
• Wilderness Support Center (The Wilderness Society)
• Canadian Parks and Wilderness Society (CPAWS)
• Grand Canyon Wildlands Council
• California Wilderness Coalition
• Klamath-Siskiyou Wildlands Center (Oregon)
• Conservation Northwest
• Sky Island Alliance (Southern Arizona & New Mexico)
• Yellowstone to Yukon Conservation Initiative
• Yukon Wildlands Project
• Friends of the Boundary Waters Wilderness

LANDSCAPE PERMEABILITY RESTORATION

These groups are generally involved in protecting and restoring landscape permeability in the Four Continental MegaLinkages or are specifically involved by identifying and working to modify highway barriers, controlling off-road vehicles, opposing new roads, or restoring unnecessary and damaging roads on public lands.

• Defenders of Wildlife
• The Wildlands Network
  
• The Cascades Conservation Partnership
• Sky Island Alliance (Southern Arizona & New Mexico)
• Grand Canyon Wildlands Council
• Yellowstone to Yukon Conservation Initiative
• Tijeras Canyon Safe Passage Coalition (New Mexico)
  
• I-90 Wildlife Bridges Coalition In the Cascade Mountains of Washington State, bustling Interstate 90 is being expanded from four lanes to six, right through the heart of important wildlife corridor lands. The I-90 Wildlife Bridges Coalition is a diverse group of interests that was formed to ensure that high quality wildlife and fish passage options, both underpasses and overpasses, be included in the highway upgrade.

HEALING THE WOUNDS ECOLOGICAL RESTORATION

These groups are doing hands-on ecological restoration (stream and watershed restoration, exotic species removal, restoration of natural fire, road closures, etc.) from a continental-scale perspective.

• Western Watersheds Project
• Wild Earth Guardians (Southwest US)
• Grand Canyon Wildlands Council
• Sky Island Alliance (Southern Arizona & New Mexico)
• Nature Conservancy Forest Health 
• Restore Pedder (Tasmania) 

WILDLANDS DEFENSE

These groups defend wildlands and wildlife from exploitation using a continental-scale perspective.

• Alliance for the Wild Rockies (US Northern Rockies)
  
• Arizona Wilderness Coalition
• Campaign for America’s Wilderness
• Center for Biological Diversity
• Rocky Mountain Wild
• Defenders of Wildlife
• Endangered Species Coalition
• Friends of the Boundary Waters Wilderness
• Friends of the Clearwater (Idaho)
• Friends of Nevada Wilderness
• Grand Canyon Wildlands Council
• Great Old Broads for Wilderness
• High Country Citizens Alliance (Colorado)
• New Mexico Wilderness Alliance
• River Runners for Wilderness RRFW is working on winning wilderness designation for the Colorado River and backcountry of the Grand Canyon.
• San Juan Citizens Alliance (Colorado)
• Sierra Club - My Piece of America  Interactive website campaign designed to inspire personal connections and desire to protect wild places.
• Klamath-Siskiyou Wildlands Center (Oregon)
• Sky Island Alliance (Southern Arizona and New Mexico)
• Southern Utah Wilderness Alliance
• Wild Connections (Colorado)
• Wild Earth Guardians (US Southwest)
• Wild South
• Wilderness Watch
• Wilderness Support Center (The Wilderness Society)
• Wilderness Workshop (Colorado) - Wilderness Workshop works to protect public lands on the West Slope of Colorado We use in research, education, legal advocacy and grassroots organizing to protect the ecological integrity of these public lands.
• World Wildlife Fund
• Wyoming Wilderness Association

CHILDREN'S OUTDOOR EDUCATION

• Children & Nature Network - connects children, their families and communities to nature through innovative ideas, evidence-based resources and tools, broad-based collaboration and support of grassroots leadership.

NATURAL HISTORY / INTERESTING INFORMATION

• Animal Base - Taxonomy. A copyright-free open access to historical zoological works. Provides manually verified lists of names of zoological genera and species in a database that should include most names of zoological taxa established from 1757 until  1788.
• Encyclopedia of Life - mission is to increase awareness and understanding of living nature through an Encyclopedia of Life that gathers, generates, and shares knowledge in an open, freely accessible and trusted digital resource.
• Listen to Nature - 400 samples from the British Library collection of a vast array of sounds from nature. While you're there, check out The Language of Birds.
• Discover Life - organized taxonomically, the All Living Things section provides descriptions, photos and other information about 270,000 global species.