Growling is the low, gutturalvocalization produced by predatory animals to express anger. In articulatory phonetics, the term guttural consonant is sometimes used to describe any of several consonantal speech sounds whose primary place of articulation is near the back of the oral cavity, specifically some velar consonants, uvular consonants, pharyngeal consonants, and epiglottal consonants (q. ... In animals, vocalization is a means of communication generated in many cases by their primitive versions of vocal chords. ... This snapping turtle is trying to make a meal of a Canada goose, but the goose is too wary. ... Anger is a term for the emotional aspect of aggression, as a basic aspect of the stress response in animals whereby a perceived aggravating stimulus provokes a counterresponse which is likewise aggravating and threatening of violence. ...
The death grunt (also referred to as death growl, death vocal or cookie monster vocal) is a singing style usually employed by vocalists of the death metal and fl metal musical genres, but also can be heard in a variety of heavy metal subgenres.
Possessed is considered by some to be one of the earliest bands to employ death growls, as are Necrophagia and Master.
Also, Chris Barnes (from Cannibal Corpse) is notable for having deepened his grunts to tones lower than those which had been recorded at the time.