Runner

The Runner Xenomorph is known primarily for its low-key appearance and shallow ranks within the hive hierarchy.

Anatomy and Genetics
The Runner results from the embryonic impregnation of a quadruped host (in the 3rd Alien movie a dog).

It is born with arms and legs, already half the size of it's Adult form.

It walks permanently on all fours, whereas a normal Xenomorph can switch from all-fours to upright and back again.

It's back has no spines, for purposes of better mobility, i.e. rotation of the head.

It is much faster than other Xenomorphs, but has limited strength.

It suffers from substantialy lower intelligence than other species of Xenomorph. This being said, it has been noticed that Runners were the lowest chain in a hive-like hierarchy, mostly used for sentry or reconnaissance, leaving the more internal job of hive care to the higher Drones.

Appearances and Sources

 * Aliens Vs. Predator 2
 * Aliens Vs. Predator: Extinction
 * Alien³

Other Strains

 * Acid Alien
 * Arachnid Alien
 * Arachnoid
 * Bodyburster
 * Bull Alien
 * Carrier
 * Chrysalis
 * Commander Alien
 * Defender
 * Empress
 * Flying Alien
 * Flying Queen
 * Gorilla Alien
 * Infectoid
 * Jock-Alien
 * K-Series
 * Killer Crab Alien
 * King Alien
 * Leech Alien
 * Mantis Alien
 * Night Cougar Alien
 * Panther Alien
 * Praetorian
 * Predalien
 * Queen Facehugger
 * Queen Mother
 * Ravager Xenomorph
 * Razor Claws
 * Rhino Alien
 * Rogue Alien
 * Scorpion Alien
 * Smasher
 * Snake Alien
 * Super-Evolution Alien
 * Swarm Alien
 * Swimmer
 * White Hybrid
 * Wild Boar Alien
 * Xenoborg