Flytrap

A Carnivorous Plant is a type of enemy in Luigi's Mansion: Dark Moon. Found in Haunted Towers and Treacherous Mansion, they attack Luigi and do about ten hearts of damage by swallowing him whole when they see him.

To defeat them, Luigi needs to take a spiky fruit off of a nearby plant and shoot it at the plant's mouth, at which point it'll die. In Treacherous Mansion, the same strategy can also be used with a cooked chicken to get a certain Diamond from behind the plant.

They can be stunned for a brief time with the Strobulb, but are otherwise unaffected by Luigi's normal means of attack.

Trivia

 * Given how they get more common after the first and second missions in Haunted Towers, it seems likely these plants are escaped laboratory experiments that have escaped to take over much of the building. This can be seen by how their first appearances are in a glass tube in the Gardener's Lab and in the Plant Nursery.