Reptiles and arthropods can regenerate limbs, but why not mammals? Is this related to evolution?

They use body fluids as hydraulic fluids, joints as hydraulic devices and partially contracted muscles as hydraulic pumps. So as to realize the bending of the joint. Next time you meet a cockroach (we oppose animal violence and euthanize it with slippers), pull your legs out. Squeeze your thigh at this time, can you see the cockroach's leg? Kick? Soon ... if cockroaches are disgusting, you can try locusts. Arthropods are quite successful in evolution. Arthropods are very different from us. They don't have what we usually say? Blood vessels? . Their tissues are directly soaked in blood, which also tells us why arthropods grow bigger under the condition of high oxygen content, so don't spray blood everywhere to escape/get hurt.

Most arthropods are. As for how it cut off its leg by itself, do you know that if it is too hard/twisted, it will pull it down by itself ... In a short time, it will be used as a reflection to distract attention from possible sources of danger, and then it can escape ... The leg can grow back, that is, the long process is slow, so when eating crayfish, you can see that some crayfish are bigger than pliers. Limb regeneration only occurs in long-lived species, such as lobsters, crabs, spiders and scorpions. Many species of Chlamydomonas can regenerate broken body injuries.

Many species of laver can regenerate crushed body damage, and some sponges can regenerate from fragments to the whole body. Most echinoderms can regenerate defective bodies. Some hydras and some jugular jellyfish can regenerate complete bodies from fragments outside their tentacles, and the cells in the fragments can be rearranged into small individuals or larvae without increasing the number of cells. Beasts, jellyfish, etc. You can reverse your life cycle after being seriously damaged or broken, and be reborn from a seemingly dead state. Many species of flatworms can regenerate defective bodies, and some species of turbot can regenerate the whole body from fragments that account for one-seventh of the original volume.