Pit Drone

The Pit Drone is a type of Race X alien encountered in Half-Life: Opposing Force.

Appearance
Pit Drones are short, bipedal creatures with a head that sports a pair of black eyes (one on either side), tentacle-like appendages near the creature's mouth, and rows of sharp spines protruding from pores on the creature's forehead. A Pit Drone's arms end in long, scythe-like claws, which it can use to make vicious slashing attacks.

Combat Behavior
Pit Drones are fast and fairly intelligent, typically traveling in packs of five or six, and are capable of making flanking movements to quickly surround their prey. The Pit Drone has two forms of attack: firing their head-spines with acid jets when at long range or charging towards their target to deliver a deadly slash from their claws. Some Pit Drones appear to be incapable of their head spine attack, appearing to have depleted their ammunition of spines.

Trivia

 * The Pit Drone sounds appear to be deformed dog sounds.
 * Strangely Pit Drones will attack a shockroach if it doesn't have a host despite it being part of Race X.

List of appearances

 * Half-Life: Opposing Force