The Sachs' organ that allows stalkers to turn invisible shares its name with the organ used by electric eels for their electric discharges.In some areas with stalkers, bandits have hung signs to warn of 'Invisibl Assholes!' which should be read as 'Invisible Assholes!'.Sexual intercourse between two stalkers is very rare and usually by accident. Stalker wings are vestigial but still somewhat functional, allowing them to glide.Cloaked stalkers cannot be Phaselocked.While cloaked, stalkers will not take continuous damage from Tesla grenades, but they will take damage from the initial and ending explosions.When damaged by an elemental weapon, the respective element's colour ( incendiary, corrosive, shock, and slag) can be seen in the outline. Cloaked Stalkers emit a purple outline when damaged.While using Zer0's Decepti0n skill, all stalkers are highlighted even if they are cloaked.Longbow tesla grenades are useful for removing stalkers' shields, and after that, an incendiary weapon with a wide spread pattern, such as the Sand Hawk, Veruc, or Sawbar, will simplify killing them. It is advisable to find a chokepoint in the terrain for fighting stalkers, as this will reduce their rapid movement, and make them easier to target. Most stalkers become far more cautious once their shields are down they will let out a distinctive roar, and then back off to recharge. Different varieties of stalker attack in different ways - Needle Stalkers prefer to hang back and fling spines from their tails, Spring Stalkers jump in and out of melee range, and Ambush Stalkers tend to pounce into melee and stay there until and unless their shields are depleted. Their natural shield can be quickly depleted by shock damage, and when this fails they also lose their ability to cloak until the shield regenerates. Only when they are close enough to pounce do they reveal themselves, and then they will leap and try to slash at their prey.

Stalkers vanish when they detect prey nearby, then proceed to creep up on their victim.

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