When was National Geographic's famous yellow rectangle first introduced as part of their brand identity?

National Geographic has been bringing the wonders of wildlife and nature into our homes for generations. Their iconic brand has evolved while maintaining its distinctive identity. This trivia question explores one of the most recognizable logos in wildlife media and conservation. Test your knowledge about this famous emblem that represents exploration, education, and wildlife preservation around the globe!

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1888 - The year the National Geographic Society was founded
1903 - When it first appeared on the cover of National Geographic Magazine
1947 - After WWII when they expanded into wildlife documentaries
1970 - During their rebranding to focus more on environmental conservation