it is a starfish can regenerate by growing a new body part for the loss of an arm or a leg the body part grows too big when it grows back so the animal will grow to catch up
One is a water bear, its not actually bear but more of a bug type thingy. You can freeze it solid and it will still be alive 100 years later after the ice melts and regenerate all of its lost or...
Many lizards can regenerate their tails; axolotls can regenerate toes, or even internal organs. Many insects and spiders can regenerate lost limbs, but usually they have to wait until they molt (shed...