"I shall never forget my first encounter with gorillas. Sound preceded sight. Odor preceded sound in the form of an overwhelming, musky-barnyard, humanlike scent. The air was suddenly rent by a high-pitched series of screams followed by the rhythmic rondo of sharp pok-pok chestbeats from a great silverbacked male obscured behind what seemed an impenetrable wall of vegetation."
Source : Dian Fossey (2000). “Gorillas in the Mist”, p.3, Houghton Mifflin Harcourt