Which wildlife conservation organization introduced a 'reverse mascot' campaign where instead of creating a cartoon character, they used the silhouette of a missing animal to represent extinction threats?

Brand mascots have played a crucial role in marketing wildlife conservation organizations and animal-related products. These iconic characters not only create brand recognition but often help educate the public about endangered species and conservation efforts. This trivia question tests your knowledge of one particularly unique wildlife mascot that broke traditional marketing norms and created a lasting impact in conservation awareness campaigns.

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World Wildlife Fund (WWF) with their 'Empty Spaces' campaign
Wildlife Conservation Society (WCS) with their 'Vanishing Icons' initiative
International Union for Conservation of Nature (IUCN) with their 'Species Not Found' program
Taronga Conservation Society with their 'Unextinct' campaign featuring negative space animals