Which wildlife conservation organization was the first to use an endangered animal as its official brand mascot?

The use of animal mascots has been a cornerstone of brand identity for many companies, creating memorable connections with consumers. Wildlife mascots in particular have helped companies stand out while raising awareness about conservation. Test your knowledge about the history of wildlife brand mascots and their evolution through the decades. Do you know which iconic animal mascot pioneered this marketing approach?

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World Wildlife Fund (WWF) with the Giant Panda in 1961
National Wildlife Federation (NWF) with the Raccoon in 1936
The Wildlife Conservation Society with the Tiger in 1953
International Union for Conservation of Nature with the Rhino in 1948