From the Super Mario Wiki, the Mario encyclopedia
Bungee Piranhas are purple Piranha Plants that use their long stem as a bungee cord. They first appeared in Yoshi's Island DS. They hang on ceilings, waiting for prey (which is usually a Yoshi) to come along. They then bungee down, attempting to grab their prey. Their stems also have spikes on it, so touching it will harm the Yoshi. A boss version called the Big Bungee Piranha appears in World 2's Castle, Big Bungee Piranha's Lair. They appear in The Cave That Never Ends, Let There Be Light!, Yoshi on Stilts, Yikes! Boiling Hot!, Big Bungee Piranha's Lair, Moving Statues, Standing Statues, and Superhard Acrobatics.
Bungee Piranhas reappear in Yoshi's Crafted World and behave the same way they did in Yoshi's Island DS. However, their stems are no longer spiky and can be passed through by Yoshi. They also have thin spikes on their heads, although this is more of a visual difference. Bungee Piranhas only appear in Jumping to Victory, where they try to blend in with harmless (regular) Piranha Plant-colored Party Balls.
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