Which wildlife conservation organization pioneered the 'Adopt an Animal' subscription model in the 1970s that has since been widely replicated across the conservation industry?

Subscription models have revolutionized how we support wildlife conservation efforts. Organizations have developed innovative ways for people to contribute to animal protection and habitat preservation through recurring donation programs. This trivia question explores a groundbreaking subscription model that changed how people connect with endangered species protection efforts.

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World Wildlife Fund (WWF)
The Nature Conservancy
Greenpeace
National Wildlife Federation