marker moved here to namibia which has the largest cheetah population on earth. then her one-woman operation has exploded. her foundation now employs scores of people who study cheetahs in the lab, in the field, and on this huge reserve. >> go, go. >> when you're keeping the fastest land mammal on earth in captivity, you need to provide the opportunity to stretch the legs a little bit. these cheetahs are chasing our truck which they know is filled with fresh meat. after a suitable workout, lunch. do i get to do the honors? what are we feeding? >> donkey. >> okay. here's a donkey. great. boom. did she go down? >> okay. >> you're welcome. >> and this is how they're exercising the baby cheetahs today, letting them chase a rag attached to a lley. >> there's soraya. she's very fast. >> they can reach speeds up to 80 miles an hour. >> see, we keep them exercised because they're in captivity and they can't run after the antelope. >> in the audience today a group of students from the dwindling number of countries where cheetahs still exist. they have come here to learn f

marker moved hire to namibia from california about 19 years ago.tahs are chasing our truck, which they know is filled with fresh donkey meat. here's some donkey meat. whoa. >> so, their extinction is happening now. if we're not working more quickly and rapidly in conservation, cheetah's not gog to be on earth in the next 20 years. >> reporter: 100 years ago, there were 100,000 cheetahs on earth. now, 90% of them are gone. their greatest asset is also their greatest liability. their hunting prowess is getting them in trouble with farmers. it was a shooting by a farmer that caused sariah, quay sar and phoenix, to come live with dr. marker. >> they were young. and the mother was pregnant. he could see the stomach moving. this is a kangle. and she just came from texas. >> reporter: dr. marker hasome up with a counterintuitive way to stop farmers from shooting cheetahs. she's using dogs to save cats. >> they grow up in the flock. and then, they act as a guardian. , what they do is they bark loudly. >> reporter: this is chewbacca, who dr. marker adopted

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