Which wildlife conservation organization pioneered the 'adoption' marketing model in 1973, allowing donors to symbolically adopt endangered animals?

Test your knowledge about a groundbreaking advertising campaign that transformed wildlife conservation awareness and fundraising methods. This campaign not only changed how environmental organizations marketed their cause but also revolutionized public engagement with wildlife protection efforts. The innovative approach created a template that many conservation groups still follow today.

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World Wildlife Fund (WWF)
National Audubon Society
The Nature Conservancy
Sierra Club