Stalking Piranha Plant

Stalking Piranha Plants are sub-species of Piranha Plants that appear in New Super Mario Bros. Wii. They appear in World 5, Toxic Forest, as common enemies. When Mario isn't around, they walk around on two legs, like Ptooies. When Mario approaches however, they stretch out their necks to block Mario's path and to attack him. The Piranha Plant's in Mario Party 3 also have legs. This might have been the inspiration.