Snarl
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For the character from the fictional Transformers Universe, see Snarl (Transformers).
For the notification system for Windows OS, see Snarl (software).
A man snarling
A snarl is a facial expression, where the upper lip is raised, and the nostrils widen, generally indicating hate, anger or pain. In addition to humans, other mammals including monkeys and dogs snarl, often to warn others of their potential bite. In humans, snarling uses the levator labii superioris alaeque nasi muscle. Snarling is often accompanied by or used synonymously with threatening vocalizations (it may also be used as an onomatopoeia for a threatening noise, as in the 'snarl' of a chainsaw). The atrophy of this muscle with age makes sometime a symmetrical or asymmetrical Alar vertical retraction and accentuates the "tear trough. Then the nose looks always bigger when we age.
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