Which wildlife conservation organization pioneered the 'adopt an animal' symbolic adoption program that became a model for the entire industry?

Conservation organizations constantly innovate their products and approaches to protect endangered species and habitats. Behind these innovations are strategic branding decisions that help connect with donors and raise awareness. This trivia question explores how a major wildlife conservation organization revolutionized its product line with an unexpected innovation that significantly increased fundraising and public engagement.

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