Gaugau

Gaugau (ガウガウ) is an enemy in Wario Land: Super Mario Land 3 and Wario Land II. These aggressive creatures are members of the Black Sugar Gang of pirates who tend to attack by throwing various projectiles.

Strategy
In Wario Land: Super Mario Land 3, they walk back and forth until they spot Wario, at which point they will attack by throwing a knife. If the knife hits a wall, it will stick there for a few seconds and Wario can use it as a stepping stool.

In Wario Land II, unlike their predecessors from the original game, they are seen leaping out of windows in positions. When Wario comes near them, they will attack by throwing an infinite amount of beer bottles that will harm him on contact.