Article:
D&D 4th ed: The Face Hugger Ooze

Just when you thought you knew all about Oozes, here is another variety to throw at your players.

The dreaded Face Hugger is unlike any other Ooze, in that it is very fast and agile. The hugger is always in motion, hunting down morsels of food, feeling for the vibrations of any animals it can track down and attack.

Normally quite small, the Face Hugger keeps to the shadows, using cracks and crevices to move as close to its prey as it can before pouncing, it prefers a jumping ambush from a position of total concealment, but will tenaciously chase down fleeing prey if need be.

Like the Cheetah of the oozes, the Face Hugger is so named because it will attempt to latch onto the face of it's target, blocking the air ways, constricting and suffocating it to death. Brute attacks against it while it is latched onto an ally's head is liable to inflict almost as much damage to the victim as to the Ooze, but with some assistance, the ooze can be torn free by hand.

When an attempt to choke a victim to death fails, the Face Hugger can put on a startling burst of speed, covering ground rapidly to find cover and attempt to position itself for another leaping attack.
While the Face Hugger is as mindless as the rest of its kin, this ooze is able to discern what sort of prey it can suffocate, and is very skilled at targeting the head or face of any living targets (although it is not fully understood how it manages to figure this out, given its rudimentary level of intelligence).

While the Face Hugger is normally found in subterranean environments, it can range over a fairly large area, quickly patrolling around the countryside surrounding the entrance to a cave, dungeon or ruin each night, retreating back to the safety of the shadows during the day.