Which wildlife conservation organization pioneered the 'Adopt an Animal' subscription model that became widely replicated across the conservation industry?

Many conservation organizations use subscription models to fund their wildlife protection efforts. These regular donations help provide consistent resources for animal protection, habitat preservation, and anti-poaching initiatives. Test your knowledge about how these subscription models work in the wildlife conservation sector!

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World Wildlife Fund (WWF)
The Nature Conservancy
National Audubon Society
African Wildlife Foundation