Filmed in the Sabi Sand Wildtuin, Greater Kruger National Park, South Africa A roar is a deep, bellowing outburst of sound forced through an open mouth. It is produced by animals of certain species.

Africa, south of the Sahara, is home to the richest diversity of animal life on the planet ... by little more than an unfamiliar smell or sound — an agitated rhino can reach speeds of up ...

Human voices cause considerably more fear in wild mammals than the sound of lions, a study in South Africa has found ... About 95% of animals were extremely frightened and quickly ran away.