Which wildlife conservation organization pioneered the 'Adopt an Animal' subscription model in the 1970s that has since been replicated by numerous other conservation groups worldwide?

Test your knowledge about innovative subscription models in wildlife conservation! Many conservation organizations have developed creative ways to engage supporters through subscription-based programs that help fund protection efforts for endangered species and their habitats. These models often include different tiers of benefits while creating sustainable funding streams for critical conservation work. How much do you know about these wildlife subscription innovations?

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