1. Lift it up
2. เม่น Porcupine แต่ hedgehog ไม่ใช่เม่น แต่ป็นสัตว์มีคนแหลมคล้ายเม่นคะ
3. curve
4. Really? or is it true? or are you serious? or Seriously?
Porcupines are rodents with a coat of sharp spines, or quills, that defend them from predators.
From ancient times it was believed that porcupines can throwtheir quills at an enemy. This has long been refuted, being the result of loose quills being shaken free.
Quills
Porcupines' quills or spines take on various forms, depending on the species, but all are modified hairs coated with thick plates of keratin, and they are embedded in the skin musculature. Old World porcupines (Hystricidae) have quills embedded in clusters, whereas in New World porcupines (Erethizontidae) single quills are interspersed with bristles, underfur, and hair.
Porcupine quills are as sharp as needles, detach very easily, and will remain embedded in an attacker. Unlike needles, however, the quills of porcupines have microscopic, backwards-facing barbs on the tip that catch on the skin making them difficult and painful to extract. Quills are about 75 millimeters (3.0 in) long and 2 millimeters (0.079 in) in width. If a quill becomes lodged in the tissues of an animal, the barbs act to pull the quill further into the tissues with the normal muscle movements of that animal, moving up to several millimeters in a day. Predators have been known to die as a result of quill penetration and infection. Quills are still capable of penetrating animals after death.
Quills are released by contact with them, or they may drop out when the porcupine shakes its body, but cannot be projected at attackers, contrary to popular belief. New quills grow to replace lost ones.