The sea creature known for its remarkable ability to regenerate lost limbs is the axolotl, a type of salamander. Unlike many other species, axolotls can regenerate not only limbs but also parts of their heart, brain, and spinal cord without scarring. This regenerative capability is attributed to their unique cellular processes and the presence of certain stem cells. Research on axolotls has significant implications for understanding regeneration in humans and could potentially lead to advancements in medical treatments and therapies for injuries and degenerative diseases.