Which wildlife conservation organization pioneered the 'adoption' marketing model where supporters receive a stuffed animal and certificate when they symbolically adopt an endangered species?

Test your knowledge about groundbreaking marketing strategies that have helped protect endangered species and their habitats. Conservation organizations have increasingly adopted sophisticated product marketing approaches to raise awareness and funding for wildlife protection efforts. This trivia question focuses on a particularly successful and innovative campaign that changed how conservation organizations approach marketing.

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World Wildlife Fund (WWF)
The Nature Conservancy
Conservation International
National Wildlife Federation