According to the National Geographic, we have recently learned that elephants have a skill for mimicry. Specifically some orphaned elephants in Tsavo National Park in Keyya have been found to be able to mimic the sound of trucks on the near by highway. It is not clear why an elephant would want to sound like a truck. Perhaps these elephants are simply responding to the call of the open road. Perhaps they want to switch from being trunk drivers to truck drivers.