
Desert Worlds
Why Elephants Eat the Baobab Tree
The elephant has a special relationship with the baobab, eating its fruit and spreading its seeds. The elephant also uses this tree as a key water source during migration, using it's water-rich inner wood to quench their thirst on long migrations. This damages the baobab, but it normally regenerates. Global warming has disrupted this cycle.
Episode Clips

How Saguaro Cacti Store 1000 Gallons of Water
The saguaro features a pleated surface which allows it to expand.

The Plant that Makes Its Home on a Cactus
Tristerix seeds travel in bird droppings to invade the bodies of giant cactus.