CLEAN : Rescued circus lions take first steps on African veld

The video discusses the behavior and conditions of animals during a flight. Initially, some animals were anxious but later became calm and curious. They were fed game meat, which is part of their regular diet. The animals communicated and formed a 'super pride.' During the flight, one lion's roaring initiated a chain reaction, creating a deafening yet beautiful sound.

How did the animals communicate with each other?

What was described as the most beautiful sound in the world?