Which wildlife conservation subscription model was first to offer 'symbolic animal adoptions' that include personalized certificates and regular updates about the adopted species?

Conservation organizations rely heavily on effective branding and marketing to raise awareness and funding for wildlife protection. This trivia question tests your knowledge about an innovative subscription model that revolutionized how people connect with endangered species conservation efforts. Can you identify which pioneering approach changed the game for wildlife fundraising?

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World Wildlife Fund's Species Adoption Program (launched 1973)
National Wildlife Federation's Animal Guardians (launched 1985)
Conservation International's Wildlife Sponsors (launched 1968)
The Nature Conservancy's Species Stewards (launched 1977)