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A staple of the Half-Life series, not much is known about the Barnacle other than that they are from Xen and will eat just about anything, friend, foe, or gas can. Also, for a creature of seemingly very limited intelligence, it always knows the best places to attach itself.
 
In Half Life: Opposing Forces, Sheppard can use a Barnacle as a weapon. The Barnacle gun was not only used for grabbing various enemies and pulling them in to be munched, but Sheppard could use it as a Grappling Hook to get to those out of reach places.

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