The thickest long spines on a porcupine's body are as thick as chopsticks and can reach a length of more than 30 centimeters, and the color of each spine is a black section and a white section, black and white. The spines are even more numerous, with tens of thousands of spines on a single porcupine's body.

The spines of different porcupine species have different shapes, though all are altered quills with a keratinized surface embedded in the skin's muscle tissue. Porcupines in Asia, Africa and Europe have their spines in bundles, while porcupines in North and South America have their spines interspersed with the hairs.

The porcupine's spines are sharp and easily dislodged, and will pierce into the body of an attacker. Their spines have barbs that can hang on the skin and are difficult to get rid of.

When a porcupine encounters a threat from an enemy, it first puts up a sharp spine on its body and rubs the spine to make a "swish-swish" sound, and at the same time its mouth makes a "pfffffffffffffffffffffffffffffffffffffffffffffff sound to terrorize the enemy. If the enemy does not retreat, the porcupine turns around, stomps on its hind feet, and strikes at the enemy with the spines on its back and tail. Although lions and tigers are ferocious, it would be terrible for them to be stabbed by porcupines, because some of the quills have barbs on them, and when they are stabbed, the quills stay in the muscles, causing unbearable pain, and in severe cases, they even die.

So, in the animal world, is particularly ferocious animals also know that the porcupine's awesome, who do not want to mess with it.

The porcupine's legs are long, with five toes on the front and hind feet, and smooth underfoot; the tail is extremely short, hidden under the spines, and the dozens of spines at the end of the tail have evolved into bristles, which are enlarged at the top and are shaped like a set of "little bells".

When walking, these "little bells" hit each other, emitting a loud and clear "click, click" sound, which can be heard dozens of meters away, often making the ferocious predatory beasts dare not approach.