Which of these famous wildlife conservation brand mascots has been in use for the longest time?

Brand mascots play a powerful role in conservation marketing, creating emotional connections between people and wildlife causes. These animal ambassadors have helped organizations raise awareness and funding for species protection worldwide. Test your knowledge of these iconic wildlife brand mascots and their impact on conservation efforts. Do you recognize which famous animal has been representing its organization the longest?

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WWF's Giant Panda (introduced in 1961)
National Wildlife Federation's Ranger Rick Raccoon (introduced in 1968)
The Wildlife Conservation Society's Snow Leopard (introduced in 1959)
Defenders of Wildlife's Wolf (introduced in 1965)