Which advertising innovation, first used by WWF in 1961, revolutionized wildlife conservation fundraising by allowing donors to symbolically 'adopt' endangered animals?

In the competitive world of wildlife conservation fundraising, organizations must constantly innovate their advertising campaigns to capture public attention and support. One campaign in particular revolutionized how conservation organizations approach marketing, creating a template that many others have since followed. Test your knowledge about this groundbreaking advertising technique that changed wildlife conservation fundraising forever.

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Species Adoption Programs
Celebrity Wildlife Ambassadors
Tragedy-focused Documentaries
Wildlife Photography Contests