Piranha plant

From The DS Ultimate Wiki

The pirana plant is an enemy in all the mario series. This carnivore flower loves annoying Mario. In most mario series you can defeat it with a shot of a bro flower. In super mario 64 you have to use another technique. It usually gives you one coin, or 5 coins for a big pirana plant.

Pirana plant appearance

The pirana plant is a flower which lives in pipes or on ground. They are red with white spots and...sharp teeth. It has a green(ish) stem and not very good-looking lips. In the older mario series, it was orange and lime green.