Which wildlife conservation organization first pioneered the popular 'adopt-an-animal' subscription model in 1973, allowing supporters to symbolically adopt endangered species?

Conservation efforts for endangered species have evolved significantly in recent years, with innovative subscription models allowing everyday people to participate in wildlife protection. These programs have revolutionized funding for conservation organizations, creating sustainable revenue streams while engaging supporters in new ways. Test your knowledge about one groundbreaking subscription model that changed how we support animal conservation!

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World Wildlife Fund (WWF)
The Nature Conservancy
Wildlife Conservation Society
National Wildlife Federation