Which product design principle revolutionized wildlife tracking collars in the 2010s, making them significantly more effective for long-term research?

Conservation organizations develop various products to support wildlife monitoring and protection. These innovative designs often blend technology with natural elements to be minimally invasive while maximizing effectiveness. This poll tests your knowledge about an important product design approach that has revolutionized wildlife tracking systems in recent years.

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Biomimicry design that uses materials matching animal fur colors
Solar-powered rechargeable batteries that eliminated the need for recapture
GPS units that only activate when animals are moving to save power
Biodegradable casings that dissolve after a programmed research period