Marine animals known for their ability to regenerate lost limbs include starfish and axolotls. These species possess remarkable regenerative capabilities, allowing them to regrow missing arms, legs, or other body parts after injury. Starfish, for example, can regenerate entire arms, and in some cases, a severed arm can grow into a new starfish. Axolotls have the ability to regenerate limbs, spinal cord, heart, and even parts of their brain. Understanding the mechanisms behind these regenerative processes has significant implications for regenerative medicine.