They have the most impressive nervous system in the entire invertebrate world. They have about a half a billion neurons that are distributed throughout their body, such that two-thirds of the neurons are actually in its legs.
Tienen el sistema nervioso más impresionante de todo el mundo invertebrado, y unos 500 millones de neuronas distribuidas por el cuerpo, de modo que dos tercios de ellas se encuentran en las piernas.