Which wildlife conservation organization pioneered the 'adoption' retail model where customers 'adopt' endangered animals and receive a stuffed toy and certificate?

Many companies in the animal and wildlife sector have pioneered innovative retail strategies to support conservation efforts while building successful businesses. These companies have found creative ways to connect consumers with wildlife causes through their purchasing decisions. This trivia question tests your knowledge of one particularly successful retail innovation in wildlife conservation merchandising.

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