Giraffes very rarely make sounds, but they do have the ability to make noises such as moos, snorts, hisses, grunts and flute-like sounds. It has been suggested through various studies that the sounds giraffes make are often below the level of human hearing. Therefore, it is a common misconception that they do not have voices.
If a giraffe is startled or feels threatened, it may make a snorting sound, or it may just wander off. In the wild, giraffes often indicate to other animals that danger is nearby, and when a giraffe herd takes off, most other animals will follow. Humans, lions and crocodiles are the only species that hunt giraffes.