Which wildlife conservation subscription model pioneered the concept of 'digital adoption' where subscribers receive updates about their specific adopted animal?

Conservation organizations have developed innovative subscription-based programs to fund wildlife protection efforts worldwide. These models not only provide sustainable funding but also create unique connections between donors and the animals they help protect. Test your knowledge about these subscription approaches that are revolutionizing how we support endangered species and habitat preservation.

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WWF's Species Guardian program (1973)
National Geographic's Wildlife Watch (1992)
Conservation International's Wildlife Protector (2001)
The Nature Conservancy's Animal Tracker (1988)