Growling

Growling is a low, guttural vocalization produced by animals as an aggressive warning but can also be found in other contexts such as playful behaviors or mating. Different animals will use growling in specific contexts as a form of communication. In humans, low or dull rumbling noises may also be emitted when they are discontent with something or they are angry, although this human sound is often termed "groaning".

Animals that growl include felines, bears, canines and crocodilians. The animals most commonly known for growling are canines, bears, and felines.

Grrr /ˈɡɹ̩ːː/ is an onomatopoeic word which imitates the growling sound of animals, often used with other related meanings. It is one of the rare pronounceable words of the English language that consists solely of consonants.[citation needed] Its most simple use is by children imitating animals. An example would be: "Mom!, Dad!, Look at me! I'm a polar bear! Grrr!" This word is also widely used in various titles to express growling when written.