Which wildlife conservation marketing campaign first introduced the 'adoption certificate' model that revolutionized nonprofit fundraising in the 1970s?

Test your knowledge about innovative marketing strategies in the wildlife conservation sector! Major animal and wildlife organizations have pioneered unique approaches to raise awareness and funds for endangered species protection. From celebrity partnerships to viral campaigns, these marketing initiatives have transformed how the public engages with wildlife conservation efforts. Can you identify the groundbreaking campaign that changed the game?

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WWF's 'Adopt an Animal' program (1973)
National Wildlife Federation's 'Wildlife Sponsorship' initiative (1982)
Greenpeace's 'Save Our Species' campaign (1975)
Dian Fossey Gorilla Fund's 'Guardian Gorilla' program (1978)