Which digital marketing campaign first successfully used 'adoption certificates' for endangered animals, creating a model now used by nearly all major wildlife conservation organizations?

Conservation organizations use innovative marketing strategies to raise awareness and funding for endangered species. One campaign in particular revolutionized how wildlife conservation organizations approach digital marketing and public engagement. Test your knowledge about this groundbreaking campaign that changed the game for animal conservation fundraising and awareness.

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WWF's 'Adopt an Animal' program launched in 1973
National Geographic's 'Photo Ark' campaign from 2015
The Nature Conservancy's 'Last of Their Kind' initiative from 1988
Conservation International's 'Guardians of the Wild' program from 1995