Which retail innovation did the World Wildlife Fund (WWF) introduce that disappears from store shelves to represent endangered species?

Test your knowledge about innovative product developments in the wildlife conservation retail sector! Many companies are creating products that not only appeal to animal lovers but also directly contribute to conservation efforts. From special packaging to unique marketing approaches, these companies are changing how we shop while supporting endangered species and habitats. How much do you know about these wildlife-friendly retail innovations?

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Vanishing Packages - product packaging that gradually biodegrades while on display
Endangered Species Receipts - receipts that fade to highlight species extinction
Last Edition Products - limited inventory items that aren't restocked
Disappearing Ink Labels - product labels that slowly become invisible on shelves