Piranha Plant

A Piranha Plant, known as Packun Flower in Japan, is an enemy almost always portrayed as a leafy, green stalk topped with a white-spotted red or green globe and sharp teeth.

Appearance
Piranha Plants are large, carnivorous plants encountered throughout the Mario series; Piranha Plants are seemingly based-off Venus Flytraps, eating anything that approaches them. The head of a Piranha Plant is most commonly either red or green with multiple other colors. Originally, Piranha Plants were found exclusively in pipes, either darting-out and biting anything near or remaining still and spitting fireballs. Currently, Piranha Plants can be found both in and out of pipes and their fire-breathing ability is now rarely used﻿.

Adventure level
In Super Smash Flash 2, they may be one of the many enemies in the Adventure mode stage, Mushroom Kingdom. They appear in the beginning of the level in a pipe trying to eat the player.