1, different families and genera. Hedgehog is a heterotemperature animal in the animal kingdom, Chordata, Hymenoptera, Hymenoptera and Hyriopsis. Porcupine is the general name of animals in the animal kingdom, Chordata and porcupine family.

2. The appearance and body shape are different. Hedgehog is small in size, cylindrical in body, covered with dense thorns, with short and thin tail and large and round eyes. The porcupine, on the other hand, is relatively large, with a body length of more than one meter, and is more like an enlarged mouse. Its head and eyes are small, its limbs are short and thick, and its back and tail have long and hard spines, and the spines are long and hard, showing black and white stripes.

3. Different living habits. Hedgehogs usually move at night, feeding on insects, fruits and small invertebrates. They nest in soil holes or tree holes and are shy by nature. Porcupines prefer to be active in the daytime, and their food is mainly plants, such as bark, roots and fruits. Porcupines have poor eyesight, but they have a keen sense of smell and touch, and usually nest on the ground or trees.

4. The defense mechanism is different. Hedgehog's thorns can be used not only to protect themselves, but also to support the body. When threatened, hedgehog will shrink into a ball and use thorns to protect its soft abdomen. The spines of porcupines are more flexible and can be erected or laid flat at any time. When threatened, porcupines will use spines to repel enemies, and some porcupines' spines are forked at the ends to form hooks, which makes the spines easier to embed in the skin of predators.

5. The distribution range is different. Hedgehogs are mainly distributed in temperate regions of Asia, Europe and Africa. Porcupines are widely distributed in tropical and subtropical areas of Asia, Africa, Europe and North America.