Which wildlife conservation organization rebranded in 2000, changing its iconic logo from a panda to panda with the letters 'WWF' underneath?

Conservation organizations use powerful branding to raise awareness for endangered species and environmental causes. Their logos often incorporate symbolic elements that represent their mission and the wildlife they protect. Test your knowledge of these important wildlife conservation brands that are working to protect animals and their habitats around the world. How well do you recognize the organizations behind wildlife protection efforts?

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World Wildlife Fund (WWF)
Wildlife Conservation Society (WCS)
International Union for Conservation of Nature (IUCN)
Conservation International (CI)