Big Mouth

A Big Mouth is an enemy from the game Virtual Boy Wario Land. They only appear throughout underwater areas in Stage 3, where they hide in dark holes in the stage's background. While hiding, only their eyes are visible. When Wario approaches, Big Mouths will lunge out of the hole with their mouths wide open, attempting to bite and damage Wario if he's in front of the Big Mouth. Wario is unable to defeat them, although he is able to use the flames of Sea Dragon Wario to send them back inside their hole for several seconds; their eyes will also briefly appear stunned.

They are described by Nintendo Power as "overgrown guppies". Their appearance and behavior strongly resemble the Utsuboankō enemies from Wario Land 4, a later Wario Land series installment.