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Starfish possess an extraordinary biological ability to recover from injury, famously regrowing lost limbs. This impressive feat involves a complex biological process where, if an arm is severed, the starfish can regenerate a complete replacement. For many species, this remarkable regeneration hinges on the presence of a portion of their central disk, which houses vital organs. The entire process, from initial injury to a fully reformed arm, can be a lengthy endeavor, often taking a year or even longer to complete.
This regenerative power isn't just about repairing damage; some species can take this ability to an even more astonishing level, developing an entirely new starfish from just a single arm, provided that essential central disk tissue is still attached. This is possible due to specialized, stem-like cells that can differentiate into all the necessary tissues and organs to reconstruct a whole new organism. This incredible capacity was historically misunderstood; in the early 1900s, oyster fishermen, attempting to protect their beds from starfish predators, would chop up the sea creatures and throw the pieces back into the water (Review), unknowingly contributing to an explosion in the starfish population.
Beyond simply regrowing limbs, starfish can also intentionally shed an arm, a process called autotomy, as a defense mechanism to escape predators. Furthermore, scientists have discovered that starfish are capable of regenerating their nervous systems, a capability not seen in many other animals. This profound regenerative capacity makes them a subject of intense scientific study, offering insights into cellular repair and development that could one day inspire advancements in regenerative medicine for other species, including humans.