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According to hunter [[Martin Creaser]] they "crack open skulls and feed on brain juice".
It can pass as human but its true form is revealed in a mirror.
In [[5.11 Sam, Interrupted]],
it is disguised as a nurse called Kara. She amplifies a persons insanity to make the brain produce more chemicals like dopamine, which it likes to feed on. She feeds on the brain through a thin pointed protrusion that emerges from her wrist which she inserts into the brain.
Trivia: [http://www.imdb.com/name/nm1968493/ Lara Gilchrist] also appeared in [[1.11 Scarecrow]].