Twenty years of drought has turned the Boteti River into Botswana dust. The animals that live here endure hardship to stay alive and must adapt their behavior to survive. Herds of zebra fight over water, crocodiles dig tunnels to stay cool and elephants practice water conservation. Now for the first time in 30 years, rain has fallen, sending a stream of water through the riverbed. After years of extreme drought, the Boteti has returned in all its glory, transforming the landscape and bringing dramatic changes to the resident animals. It’s like when the contestants on “Survivor” get a food reward — buckle up for a wild ride.