They run quickly, and are very stealthy. Since not much is known about them, it probably means they are not common, but it is known that they only use their hands and feet for combat.
They sometimes have weapons, but usually go without any. They will sometimes jab with their sharp claws. They are able to jump very high, and survive high falls. They have artificial eyes, which enhance their vision.
They always appear in secret or far off missions, only if the ESS (Elite Stalker Squad) is unable to defeat the designated rebel base. They are very easy to avoid, but not outrun.