Which innovative marketing approach did the World Wildlife Fund use in their 2020 'Adopt an Invisible Animal' campaign that drove record-breaking conservation donations?

Conservation efforts for endangered species often rely on effective marketing campaigns to raise awareness and funding. In 2020, one innovative wildlife organization revolutionized their approach by using an unconventional marketing strategy that increased donations by over 300%. This campaign became a case study in nonprofit marketing. Test your knowledge about this groundbreaking conservation marketing initiative!

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AR technology allowing users to 'see' camouflaged endangered animals in their own environments through smartphone cameras
Celebrity endorsements featuring A-list actors posing with CGI endangered species
Limited edition cryptocurrency tokens representing endangered species with proceeds going to conservation
Interactive billboards in major cities that revealed hidden animals only when enough people gathered around them