Dereck Joubert

The worldwide lion population has declined a staggering 90 percent in the past 50 years. In their documentary The Last Lions, conservationists Beverly and Dereck Joubert track the giant hunters across Botswana and warn that without intervention, lions may soon go extinct.

Beverly and Dereck Joubert, wildlife documentary producers. This husband and wife team lives in northern Botswana, seven hours from the nearest village. Working and living out of a four-wheel drive vehicle, they have captured the family relationships of the last free-roaming elephants left in Africa. Their latest wildlife film, "Reflections on Elephants," contains ground-breaking footage of lions attacking an elephant calf. Previously, such attacks were thought to be only mythical. The documentary premieres on PBS this Wednesday at 8:00 PM ET.