Which innovative retail concept, launched in 1961, pioneered the 'adoption' model that allowed consumers to symbolically adopt endangered animals to fund conservation?

The intersection of retail innovation and wildlife conservation has created unique brand strategies that help protect endangered species. Many wildlife organizations have developed innovative retail concepts to fund their conservation efforts. Test your knowledge about a groundbreaking retail strategy that revolutionized wildlife conservation funding and awareness.

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WWF's Species Adoption Program
National Geographic's Wildlife Guardian Initiative
The Nature Conservancy's Animal Stewardship Project
IUCN's Endangered Species Sponsorship