Sangduen Chailert, the founder of Chiang Mai’s Elephant Nature Park (ENP), sings lullabies to the elephants under her care. She first discovered the technique six years ago when trying to relax a difficult elephant calf and the technique was so successful she maintained the practice. The ENP is a 280-acre park that looks after rescue elephants that have suffered abuse. For more about the sanctuary see the ENP’s website