BBC自然世界：森林大象

Deep in the rain-forest of Central Africa lies an elephant oasis - a remarkable place that holds the key to the future for Forest Elephants. Over the last 20 years, Andrea Turkalo has been studying these enigmatic giants, getting to know over 4,000 intimately. She has begun to unravel the secrets of their complex social lives and the meanings of their unique vocalizations. New acoustic research is shedding light on the many mysteries that still surround forest elephant society. Will these endangered elephants finally speak out and tell Andrea what it is they need to survive?