Vacuum Mouth

are enemies in.

Characteristics
It is immobile and essentially non-aggressive; its ability is to attract all creatures (both Link and enemies alike) inexorably towards it. It does so in short five-second bursts accompanied by a whooshing noise. The Vacuum Mouth first appears in the Bottle Grotto, in a room along with three Keese. The Keese are sucked into the Vacuum Mouth, and Link must cross the room while avoiding the same fate.

Should Link fall into a Vaccuum Mouth, he will be taken to the beginning of the dungeon, as with Floormasters.

Another version of the Vacuum Mouth exists which has the exact opposite ability; it expels air, preventing Link from being able to approach. This reverse Vacuum Mouth, found in Key Cavern in the room immediately to the right of the entrance, can be defeated by charging it using the Pegasus Boots.