Which conservation marketing campaign was the first to use 'adoption certificates' for wild animals, creating a billion-dollar fundraising model that's now used by nearly all wildlife organizations?

Conservation organizations often use innovative marketing strategies to raise awareness and funds for endangered species. One particular campaign revolutionized wildlife conservation marketing by creating an unprecedented level of global engagement. Test your knowledge about this groundbreaking initiative that changed how conservation organizations approach public awareness campaigns and fundraising for animals in the wild.

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WWF's Adopt an Animal program (1973)
National Wildlife Federation's Animal Guardians (1982)
The Nature Conservancy's Species Sponsorship (1968)
Conservation International's Wildlife Partners (1987)