Which wildlife conservation organization first pioneered the symbolic animal 'adoption' program as a retail product strategy in 1973, allowing supporters to 'adopt' endangered species?

Conservation organizations have evolved into powerful brands that drive awareness and funding for wildlife protection. These entities utilize sophisticated product strategies, marketing campaigns, and retail operations to support their missions. This trivia question explores how one famous wildlife conservation brand revolutionized the concept of 'adoption' programs as a product strategy, creating one of the most successful wildlife fundraising models in history.

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World Wildlife Fund (WWF)
The Nature Conservancy
National Wildlife Federation
International Union for Conservation of Nature (IUCN)