There's a stealthy nighttime battle taking place on the African savannah. It's a place where poachers stalk their prey — the animals that graze there. And they, the poachers, are in turn stalked by rangers trying to bring them in.
Now those rangers are trying out some new equipment using the kind of technology pioneered by the military.
On an evening ride in Kenya's Maasai Mara, park ranger Martine Cheruiyot hoists a 20-pound gray tube and screws it on top of a jeep. It looks a bit like an X-ray machine in a dentist's office.