Final answer:
Squid, cuttlefish, and octopus are special due to their advanced nervous systems, ability to change color and texture, and their exceptional intelligence among invertebrates, alongside features like jet propulsion and specialized cells for dazzling color displays.
Step-by-step explanation:
Squid, cuttlefish, and octopus are special because they belong to the class Cephalopoda, renowned for their intelligence and advanced camouflage abilities. These animals have unique features such as the ability to change color and texture to blend into their surroundings, or to distract predators. Their sophisticated nervous systems and complex eyes are among the most developed in invertebrates, making them excellent predators. Cuttlefish can even mimic background patterns very rapidly, using a large brain-body size ratio. Cephalopods are also equipped with specialized cells called chromatophores for color change, as well as iridophores and leucophores that reflect light, aiding in their dazzling displays. Moreover, these animals move through jet propulsion, are capable of releasing ink as a defense mechanism, and some species show extended care for their offspring.