Which animal conservation organization pioneered the 'adoption' marketing model in 1973, allowing supporters to symbolically adopt endangered species as a fundraising strategy?

Test your knowledge about influential wildlife conservation marketing campaigns! Throughout history, various organizations have employed innovative marketing strategies to raise awareness about endangered species and habitat preservation. These campaigns have not only generated funding for conservation efforts but have also shaped public opinion and policy regarding wildlife protection. How well do you know these landmark marketing moments that changed the way we view and protect our animal friends?

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World Wildlife Fund (WWF)
The Nature Conservancy
Greenpeace
National Audubon Society