Which wildlife conservation organization pioneered the 'adoption' marketing model where donors symbolically adopt an endangered animal and receive updates about their species?

Conservation organizations worldwide employ sophisticated marketing strategies to protect endangered species and their habitats. These campaigns not only raise awareness but also drive crucial funding for protection efforts. How well do you know the landmark marketing campaigns that have changed the game for wildlife conservation? Test your knowledge about the intersection of marketing innovation and animal protection!

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