Which innovative marketing strategy first allowed wildlife conservation organizations to significantly increase donations by letting supporters 'adopt' endangered animals?

Conservation organizations use various marketing techniques to raise awareness and funds for protecting endangered species and their habitats. This trivia question focuses on a groundbreaking marketing strategy that transformed wildlife conservation fundraising. Test your knowledge about how conservation marketers have successfully connected people with animal protection efforts around the world.

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Symbolic animal adoption programs where donors receive a certificate and stuffed animal
Live wildlife webcams showing animals in their natural habitats
Celebrity wildlife ambassador campaigns featuring A-list endorsements
Limited edition wildlife photography books with proceeds supporting conservation