1, different body types: porcupines are larger, with a body length of about 70 cm; Hedgehog is very small, with a body length of only 25 cm.
2. Different spines: The spines of porcupines are longer, thicker and more numerous. The longest thorn can reach 35 cm, and the number is more than 30 thousand; Hedgehog's thorns are short and thin, and the number is very small. The longest thorn is only about 2 cm, and the number is only about 5000.
3, different habits: when the porcupine is in danger, it will be very brave, erect all the thorns and boldly wave its tail to attack the enemy; When the hedgehog is in danger, it will curl up into a "thorn ball" so that predators don't want to get close.