The following organizations are active in conservation efforts in Costa Rica .
2011 Crystal Dr., Suite 500
Arlington, VA 22202
U.S. tel. 703/341-2400 or 800/429-5660
Conservation International supports conservation projects worldwide.
promotes reforestation projects and works to assist farmers in the Monteverde Cloud Forest  region to increase productivity in a sustainable manner. The League also administers the Children’s Eternal Cloud Forest Reserve .
4245 N. Fairfax Drive, Suite 100
Arlington, VA 22203-1606
U.S. tel. 703/841-5300 or 800/628-6860
Nature Conservancy identifies species in need of protection and acquires land to protect them. The Nature Conservancy currently has projects in La Amistad International Peace Park  and Corcovado National Park . Its Latin America division works closely with Fundación Neotrópica and other organizations.
The Neotropic Foundation, or Fundación Neotrópica, promotes sustainable development and conservation among local communities. It also arranges “debt-for-nature” swaps. Along with many other projects throughout the country, they maintain trails and offer guided hikes on the Osa Peninsula .
Organization for Tropical Studies is dedicated to biological research in tropical environments. It offers Rainforest Ecology Workshops in Costa Rica, where it has three research facilities and lodges open to the public at La Selva , Palo Verde National Park , and Las Cruces .
ProParques works to improve national park facilities, increase resources, foster a professional Park Rangers corps, and implement other changes that contribute to the park system’s economic viability and the visitor experience. The organization currently has programs in place at the following parks: Manuel Antonio , Arenal Volcano , Tortuguero , Corcovado , Poás Volcano , Irazú Volcano , Guayabo , Palo Verde , Carara , Cahuita , Rincón de la Vieja National Park , and Santa Rosa .
665 Broadway, Suite 500
New York, NY 10012
U.S. tel. 212/941-1900 or 888/693-2786
The Rainforest Alliance works to save rainforests worldwide.
4424 NW 13th St., Suite #A1
Gainesville, FL 32609
U.S. tel. 352/373-6441 or 800/678-7853
The Sea Turtle Conservancy works to protect turtle populations and accepts donations and volunteers.
The Titi Conservation Alliance works to protect the endangered squirrel monkey found in the areas surrounding Manuel Antonio National Park .
1250 24th St. N.W.
Washington, DC 20037
U.S. tel. 202/293-4800
The World Wildlife Fund works to protect endangered wildlife worldwide.