Spider mine

The spider mine is a type of terran self-propelled, area-denial ordnance.

A spider mine is equipped with motion sensors. Once a target enters a certain range the mine digs itself out of the ground and scurries over that distance to detonate on the target. Groups of mines may share sensor data making it difficult to traverse a spider mine field undetected.

Spider mines were non-standard equipment for vultures by the late 2490's but gradually became more popular, especially on border worlds.

StarCraft II
Spider mines were seemingly removed as of April 2009.