Which product design innovation revolutionized wildlife tracking by allowing researchers to monitor animals for years without battery replacement?

Wildlife conservation products have evolved dramatically over the years, with innovative designs helping researchers track, monitor, and protect endangered species. This poll tests your knowledge about a groundbreaking product design innovation that revolutionized wildlife tracking technology. Can you identify the correct advancement that transformed how conservationists monitor animal migration patterns in remote habitats?

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Solar-powered GPS tracking collars with flexible photovoltaic cells that conform to an animal's neck
Bluetooth-enabled tracking devices that create mesh networks between tagged animals to share location data
Biodegradable tracking implants that dissolve after sending data for a predetermined research period
Motion-powered trackers that generate electricity from the animal's movement to sustain battery life