Which innovative technology has been most effective in reducing rhino poaching in African wildlife reserves since 2018?

In recent years, conservation organizations have leveraged cutting-edge technology to protect endangered species. One particular innovation has significantly reduced poaching of rhinos in protected reserves across Africa. This technology represents a major advancement in wildlife protection efforts, combining several modern approaches to safeguard these magnificent creatures. Test your knowledge about this breakthrough conservation technology!

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GPS-enabled smart collars with real-time tracking and vital sign monitoring
Drone surveillance systems with thermal imaging and AI pattern recognition
Embedded RFID microchips in rhino horns that trigger alarm systems when removed
Audio detection systems that identify gunshots and alert rangers via satellite