WildLife Safety May Be Improved By Sensors

As you see on this site named "Utah Black Bear Rips Open sleeping Bag And Carried Off an 11 Year Old Boy...

...A good solution using existing science may be either a good sensor and alarm or even a robot defender, that wouldn't harm the bear or wildcat but that could even scare them away with high frequency sound while the camper sleeps or at least alerts them to run for safety or shut all the doors in the hut. Most optimally it would be both able to move through air and on wheels or tracks, or even in water, one good way to improve this would be via scents the machine would use to mark the camper's land. This is rather like the elephants in Kenya that have collars that call to orbit so the officials can save the elephants by moving them to where they don't damage the farmer's crops or scare the farmers.