Which innovative product design feature was first introduced by the World Wildlife Fund in their 'TrackTag' wildlife monitoring collars that revolutionized conservation efforts?

Conservation organizations often create innovative products that help protect endangered species while raising awareness. These product designs must balance functionality, educational value, and appeal to consumers who want to support wildlife causes. Test your knowledge about a groundbreaking product design that revolutionized how we monitor and protect endangered species in their natural habitats!

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Solar-powered GPS tracking that extended battery life from weeks to years, eliminating the need for recapturing animals for battery replacement
Biodegradable collar material that automatically detaches after 5 years to prevent long-term wildlife discomfort
Augmented reality integration that allowed researchers to visualize animal movements through a smartphone app
Flexible sizing technology that automatically adjusts as young animals grow, eliminating the need for multiple collar fittings