The World Wildlife Fund, also known as WWF, is an international non-governmental organization working towards preserving the world's natural resources and wildlife. It was founded in 1961 and has a presence in over 100 countries worldwide working towards advocacy, conservation, and research to protect endangered species and their habitats. Some synonyms for the World Wildlife Fund include the Wildlife Conservation Society, the Nature Conservancy, Greenpeace, and the International Union for Conservation of Nature. All of these organizations share the same mission of preserving and protecting the world's natural resources, and contribute significantly to promoting awareness about animal conservation and environmental sustainability.