They have a long metal rod with a light blue head emitting yellow colored electricity. They resemble a jackhammer, or a pneumatic drill. They also have 2 screws on their bodies that are in different sizes, which resemble eyes. Not to mention, in the game, they have 3 antenna-like structures that are only seen when they become electrocuted.
They hop along the level and can be avoided by ducking or walking under them as they jump over to Donkey Kong. It should be noted that upon hitting a wall, they will turn around and hop in the other direction. They will also jump up and down platforms, making it more stressful to avoid. They can only be defeated by throwing a barrel at them.