Brain controlled drills

 are Enemies from Bullethead. They are used by the Aliens to try to destroy the Triclopians.

Attack
The fall from the sky and can be destroyed quite easily. If they reach the ground, they will drill down and make a hole in the ground. The hole can be very dangerous to the player since they are moving on the ground and will not recognize the hole. The hole will disappear about 15 seconds later.

Movement
The Drills will fall straight down. They can be hard to kill in large numbers.