Elephants in Kenya can no longer raid villagers' crops - because their collars warn rangers via text message if they step out of their enclosure. The elephants have a mobile phone SIM card inserted into their collars that automatically sends a text message if they stray too near farms.
The rangers then use spotlights to frighten the elephants back inside the 90,000-acre Ol Pejeta conservancy.
The Save the Elephants group is using the system as an alternative to shooting the elephants. The Kenya Wildlife Service has reluctantly shot five elephants from the conservancy who refused to stop crop-raiding.
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