In a sprawling wildlife preserve in Zimbabwe larger than Grand Canyon National Park, some of the rhinos roaming the park have sensors embedded in their horns. Three times a day, the trackers send the animals’ GPS locations to solar-powered base stations, which then send the data to rangers through a mobile app.

“Each day, they look at what we call the Google map of rhinos,” says Marion Moreau, head of the Sigfox Foundation, the nonprofit arm of Sigfox, a France-based tech company that builds low-power networks for the internet of things, which designed the sensors as part of a project called Now Rhinos Speak.

Poaching is a major problem for rhinos. In 2018, in South Africa alone, 769 rhinos were killed, or an average of two a day. At the beginning of the 20th century, the global population of the animal was around 500,000; now there are around 28,000. Three species are critically endangered. The last male northern white rhino, a subspecies of the white rhino, died in 2018. Two females are left in Kenya and protected with 24-hour guards.

Read the full article about saving rhinos with GPS trackers by Adele Peters at Fast Company.