Which wildlife conservation subscription model pioneered the 'adopt an animal' monthly program that has since been replicated by conservation organizations worldwide?

Subscription models have revolutionized how conservation organizations fund their work and engage supporters. Many wildlife protection groups now offer monthly membership programs that provide sustainable funding while offering exclusive benefits to supporters. Test your knowledge about these innovative subscription approaches in the animal conservation sector!

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World Wildlife Fund's Species Adoption Program (launched 1973)
National Geographic's Wildlife Watch (launched 1985)
The Nature Conservancy's Wildlife Guardian (launched 1990)
Conservation International's Animal Allies (launched 1981)