Human: Is it true that a lion's roar can be heard from over six miles away? Assistant: 
Yes, it is true that a lion's roar can be heard from over six miles away. The average human ear can hear sound up to about 3,000 Hz, so the lowest frequency of a lion's roar is around 150 Hz. A person with perfect hearing would have no problem hearing a lion's roar at a distance of 6 miles.