Which wildlife conservation organization's retail operation became famous for pioneering the 'adoption' model, where customers could symbolically adopt endangered animals through stuffed toys and certificates?

Conservation retail has become a significant revenue source for wildlife organizations worldwide. These stores not only generate funds for conservation efforts but also raise awareness through branded merchandise and educational products. Test your knowledge about one of the most successful wildlife conservation retail operations that revolutionized how organizations fund their animal protection work.

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