Which extinct animal mascot originally represented The Nature Conservancy from 1951-1986 before being replaced with their current logo?

Many nature and conservation brands have used animal mascots to represent their products and mission, but some iconic mascots have been retired or replaced over time. Test your knowledge of these former brand representatives from the natural world industry that once graced packaging, advertisements, and promotional materials but are no longer in use today.

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A panda bear named Guardian
A bald eagle named Liberty
A redwood tree character called Sequoia
A river otter named Ripple