StarCraft II: Wings of Liberty/Zerg buildings

Most zerg structures need to be on creep to stay alive. If any structure is not on the creep they will slowly die. Only Hatcheries, Overlords and Creep Tumors can generate creep.

Hatchery

Spawns larva, creates creep and the primary zerg structure.

Lair

The second level of the Hatchery. Allows Hydralisks and Infesters to be created. Also allows overlord and overseer upgrades to be evolved.

Hive

The final transformation of the Hatechery. It has high health and allows Ultralisks to be created.

Infested Command Center

This structure does not spawn suicide soldiers and it is only seen in the campaign.

Spawning Pool

It allows the spawning of Zerglings and offers upgrades such as increased movement.

Extractor

Cost 35 minerals.

Evolution Chamber

Contains research upgrades for burrow (unlocks burrow), slime (Overlord), generate Creep (Overlord – this ability also increases Zerg buildings' Creep generation speed), and allows the Queen to produce Shriekers, increasing the range of the Sunken Cluster and Swarm Cluch abilities.

Hydralisk Den

This structure requires a Lair first and then you can spawn Hydralisks. Can upgrade the Hydralisks attack range.

Spire

Required to morph flyers and upgrade attack and defense. Takes 100 seconds to build.

Greater Spire

Required to morph the corrupter into brood lords and upgrade the air attacks and air armor to the next level.

Ultralisk Cavern

Required to build the Ultralisk which can defeat Archons and Colossus.

Infestation Pit

Allows production of Infesters.

Infested Barracks

This structure is seen in the campaign only. It must be destroyed in mission Outbreak.

Infested Supply Depot

This structure is seen only in the campaign. It must be destroyed in mission Outbreak.

Infested Starport

Appears only in mission outbreak which must be destroyed or spawns of infested humans will do non-stop attacks.

Baneling Nest

It allows Zerglings to morph into Banelings and contains Baneling upgrades (increases speed as in make the banelings roll instead of crawl).

Roach Warren

It enables the spawning of Roaches, and contains Roach upgrades (heals roach faster and allow roaches to move underground).

Nydus Worm

A worm that pops out of the ground at any location and spawns creep around it. Whats worst is that it can deliver any zerg to any location including Ultralisks.

Spine crawler

A Mobile Anti Ground defense structure that is effective against armored units.

Spore Crawler

Has high health(400) and is best against air units. Can move to a different location. Detects stealth.