Which endangered animal species was NOT used as the primary mascot for a major international wildlife conservation organization's logo?

Conservation organizations often use animal mascots to create recognizable brand identities that connect with donors and supporters. These mascots help organizations stand out in the competitive non-profit sector and build customer loyalty. Test your knowledge about these iconic wildlife brand ambassadors that have helped shape conservation marketing and fundraising efforts worldwide.

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Giant Panda (World Wildlife Fund)
Gorilla (The Gorilla Organization)
Tiger (Wildlife Conservation Society)
Snow Leopard (Snow Leopard Trust)