A celebration of the life and legacy of Echo, the world's most famous elephant, who was born in 1945 and died in 2009, and who Natural World followed for the last 20 years of her life.

The timing of Echo's death could not be worse. The wise old matriarch had guided her family for half a century but the cruellest drought in living memory devastated her home under the shadow of Kilimanjaro. Will her 38-strong band of relatives and descendants overcome the loss of their leader, hunger and poachers to survive?

Sri Lanka, the tropical island lying off the southern coast of India, is home to its own special elephants. A sub species of the Asian elephant, they have their own unique characteristics. In this programme, award winning wildlife cameraman Martyn Colbeck of Echo of the Elephants fame travels to Sri Lanka to try and get to know them. Martyn has planned his arrival to coincide with the start of the monsoon, hoping it will be the best time to find and follow a new born calf. By drawing on local knowledge, Martyn begins to unravel the complex social world of Sri Lanka's elephants - he witnesses a fight over a calf, a battle between two bulls in musk and, at an elephant sanctuary, befriends an orphaned elephant who sadly lost a leg to a snare and is facing an uncertain future.