Which wildlife conservation product line pioneered the 'buy one, give one' model where for each item purchased, the company donates to protect one endangered animal?

Conservation-focused products have revolutionized how we support wildlife protection efforts worldwide. Many companies now dedicate portions of their profits to animal welfare and habitat preservation through innovative product lines. Test your knowledge about these products that have made significant impacts on wildlife conservation while creating successful business models that consumers love to support.

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WWF Adoption Kits
Endangered Species Chocolate
TOMS Wildlife Collection
Tentree's Earth First Collection