Why can some animals like crabs, have the ability to regenerate limbs?

Question

I was casually watching videos of king crabs, lol, when I saw this video of a chef cutting just the legs of the crab and waiting for it to grow another set. It was a brilliant idea. But it makes me wonder what other species of animals share the same ability.

In: Biology

Answer 1

Because the crabs who can regrow limbs survived better in their environmental niche. This is a feature of many insect-like or lizard animals, but not something that mammals can do.