Burrow

Burrow is an ability used by ground-based zerg to temporarily conceal themselves underground. It is an ability that has led to the deaths of countless terran soldiers.

StarCraft I
It is important to note that burrowing does not need to be researched/evolved for a lurker to be able to burrow and thus attack.

StarCraft II


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When zerg units burrow in StarCraft II, the player controlling them can see part of them "sticking out of the ground", making it easier to identify them. However, they remain invisible to enemy units without detection.

Burrowed units are treated as a different unit type for UI tab selection purposes, unlike some other status effects such as burrowing.

Some units, namely roaches and infestors, can move while burrowed. Moving while burrowed produces a distortion similar to cloaking.

Some critters can also burrow too, like the lava crab.

Terrans
In StarCraft II, the supply depot has a similar burrowing ability to sink into the ground, enabling units to pass over it. However, this ability does not prevent it from being seen. The perdition turret shares this ability.