Which wildlife conservation marketing campaign pioneered the 'adoption' model that revolutionized fundraising by allowing donors to symbolically adopt endangered animals?

Conservation organizations often use powerful marketing campaigns to raise awareness about endangered species and wildlife protection. These campaigns can make or break funding efforts and public support for critical conservation initiatives. Test your knowledge about some of the most innovative and effective wildlife marketing campaigns that have helped protect our planet's biodiversity.

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World Wildlife Fund's 'Adopt an Animal' program (1973)
National Geographic's 'Photo Ark' campaign (2006)
The Nature Conservancy's 'Protect an Acre' initiative (1988)
Greenpeace's 'Save the Whales' campaign (1975)