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Carnivorous clam creature
Xen Clams, like all other kinds of Xen fauna and flora, appear most commonly in the City 17 Quarantine Zone. They are small creatures, approximately the size of a mouse, and are sessile, much like Barnacles. Xen Clams always appear in clusters. When an organic being approaches a cluster of Xen Clams, they will begin violently snapping their jaws, which cause minor damage. Clams pose very little threat to large, mobile organisms such as humans due to their immobility and small size.