Shrike turret

The shrike turret is an automated gun mounted on top of terran bunkers.

The turret was developed during the Second Great War by Raynor's Raiders, based on research into zerg spore crawlers.

Game Unit
The turret upgrade is available in the StarCraft II: Wings of Liberty campaign. It is researched in Hyperion's laboratory and costs 5 zerg research points. Players must choose between researching shrike turrets or reinforcing bunkers (+150 hit points). Shrike turrets on their own will not substitute the bunker they're attached to that's been loaded with marines. A number of units can out shoot the shrike turret but not the marines inside, allowing the marines to focus on the long range units while the shrike turret(s) take care of anything that comes in closer (namely zerglings).

Development
The turret was once designated the "Mk.8 Shrike automated impaler turret", and it was created by Servo Servants.