Which wildlife conservation organization pioneered the 'symbolic animal adoption' subscription model that has since been widely imitated across the conservation industry?

Many wildlife and conservation organizations have embraced subscription models to fund their important work. These recurring revenue streams help protect endangered species, preserve habitats, and support research efforts worldwide. How much do you know about the subscription approaches that keep these vital conservation efforts running? Test your knowledge with this trivia question!

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