around the world. rolex awards laureate schaaf cat hussein is our guest editor on call to earth for this quarter, and he s chosen this story on how conservationist amy dickman has worked to protect one of the most significant lion populations left on earth. reporter: sunrise on the edge of ruaha national park. here in central tanzania, livestock is life. translator: our tribe be believes they re part of the family, and we cannot live without them. reporter: another day, another deadly threat for livestock and people. stefano asicheka is part of a little known tribe with a long