PLANET EARTH From Pole to Pole

This is the Kalahari Desert in Southern Africa. It's the dry season and thousands of elephants have started to travel in desperate search for water. All across Southern Africa animals are journeying for the same reason. Buffalo join the great trek. Nowhere else on Earth are so many animals on the move with the same urgent purpose. They're all heading for the swamps（沼泽） of the Okavango, a vast inland delta（三角洲）.



At the moment it is dry, but water is coming. The travelers are hampered by dangerous dust storms. Females and calves can easily get separated from the main herd. For this pair sanctuary（保护区） lies in the patch of woodland a few miles ahead. They can't rest until they reach it. The main has already got there safely.



Finally, the stragglers emerge from the dust. The exhausted calf is still blinded by sand. Its mother does everything possible to help it. The storm is now subsiding, but not all the elephants have been so lucky. One youngster has got lost. Thirsty and exhausted, it follows the tracks of its mother, but sadly in the wrong direction.