Which wildlife subscription model pioneered the 'symbolic adoption' concept that lets subscribers receive updates about their specific adopted animal?

Wildlife conservation organizations have revolutionized their funding strategies through innovative subscription models that engage the public. These programs allow people to support endangered species protection, habitat preservation, and research through recurring contributions. Test your knowledge about these popular wildlife subscription models that have transformed how conservation efforts are funded in the digital age.

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World Wildlife Fund's Species Adoption Program (1973)
National Geographic's Wildlife Watch (1985)
The Nature Conservancy's Animal Guardians (1990)
Conservation International's Wildlife Sponsors (2001)