Which pioneering subscription model, launched in 1973, revolutionized wildlife conservation funding by allowing supporters to symbolically 'adopt' endangered animals?

Conservation organizations worldwide have developed innovative subscription models to fund their wildlife protection efforts. These recurring revenue streams have transformed how animal sanctuaries, zoos, and wildlife preserves operate financially. Test your knowledge about these conservation membership programs that help protect endangered species and their habitats while providing unique benefits to subscribers.

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World Wildlife Fund's Species Adoption Program
National Geographic's Wildlife Guardian Subscription
The Nature Conservancy's Ecosystem Steward Program
Smithsonian Zoo's Animal Ambassador Membership