>> when we got there, we saw the female was standing at the edge and she was frantic. >> the team knows this elephant. she's called zomba, and she's a large, powerful matriarch. >> being dominant and experienced as a mother, she was going to be a bit tougher to persuade to leave the calf alone. >> elephants are extremely devoted to their young. even though she recognizes the researchers, zomba doesn't want to leave her calf. the enormous elephant lunges back and forth, then nearly backs into vicki's jeep. >> an angry, scared mother elephant is very, very likely to attack. she weighs more than the land rover was driving, so if she wanted to, she could have flipped the car. >> vicki is putting herself in an extremely dangerous position, but she knows their only hope of saving the calf is to scare zomba away temporarily. vicki drives forward and starts shrieking.