Bristle

From the Super Mario Wiki

This article is about spiked monsters from Paper Mario: The Thousand-Year Door. For information about the porcupine enemies from Donkey Kong Country 3: Dixie Kong's Double Trouble!, see Bristles.

Paper Mario: The Thousand-Year Door Enemy
Bristle

Max HP	2
Attack	1
Defense	4
Location(s)	Shhwonk Fortress, Glitzville
Log	A petrified, spine-covered monster that attacks by charging at you and is impervious to fire. If you approach, its spikes will pop out and poke you.
Items	None
Moves	Destruction (1)
Tattle	That's a Bristle. ...Totally covered in spikes. They're so prickly! AND they're impervious to fire! Even trying to get close enough to whack it with a hammer is dangerous! Seriously, its spikes will totally pop out! So, since you can't Jump on it or use your Hammer... you'd better use an item!
Bestiary 83 84 85

The Bristles are spiked monsters made of rock and are found in the game Paper Mario: The Thousand-Year Door. They have high defense, and if Mario tries to attack one with his hammer, he'll end up hurting himself, as a spike will pop out from the Bristle once the plumber gets near. This monster is also impervious to jump attacks and fire. The Special Move Earth Tremor will defeat a Bristle, as well as a POW Block or an Earth Quake. Mario can even defeat them by just using Superguards. Strangely enough, although Mario cannot normally use a hammer attack, he can use any hammer attack if he is equipped with the Spike Shield badge - the Bristle and Dark Bristle will not even attempt to poke him with its spikes if he is equipped with this badge. If Mario attacks one with a Sleepy Sheep, the Bristle's spikes will still protrude so that Mario cannot attack them directly.

Although Bristles have made no appearances outside of Paper Mario: The Thousand Year Door, they were mentioned in Mario & Luigi: Partners in Time. Before the Mario Bros. learned the Bros. Ball move, Young Toadsworth told his older self that he "looks like he has a Bristle in his britches".