Singing Sumatran Rhino

Ever heard a Sumatran rhino before? You'll hear Delilah, a Sumatran rhino at the Sumatran Rhino Sanctuary.
This incredible sound is thought to be a mating call. Unfortunately, with fewer than 80 Sumatran rhinos left, Sumatran rhinos like Delilah are often singing alone.
Audio from Save the Rhino International.
All images credited to www.nickgarbutt.com